Repair And Fix it

The Volkswagen Passat oxygen sensor controls the amount of fuel burned by the engine. If the oxygen sensor is failing, the car will run rich, burning extra fuel and decreasing your fuel mileage. Volkswagen secures the wiring for the oxygen sensor using cable ties to prevent damage to the electrical wires from the exhaust pipe. When an oxygen sensor fails, it must be replaced. Find a new sensor at an auto parts store or Volkswagen dealer.

Instructions

1

Raise the front end of your Volkswagen Passat and secure it on a set of jack stands. Remove the jack when the jack stands are secure to provide room to work.

2

Locate the oxygen sensor between the manifold and the catalytic converter. The sensor will be protruding from the exhaust pipe with an electrical connection at the top. Pull the wiring harness free of the electrical connection.

3

Remove the cable ties on the harness, making note of where they go. You will need to replace the cable ties in the same locations to protect the wiring from exhaust damage.

4

Remove the oxygen sensor from the exhaust pipe using an oxygen sensor socket and a ratchet. Replace the sensor with a new one. Thread the new sensor in by hand to start so you do not cross thread the sensor. Tighten it with an oxygen sensor socket and ratchet.

5

Torque the oxygen sensor to 41 foot-pounds with a torque wrench.

6

Replace the cable ties on the wiring and reconnect the wiring harness to the electrical connection on the sensor.

7

Raise the car and remove the jack stands. Lower the car to the ground.

If the check engine light on the dash of your Jeep is on, stop into an auto parts store and ask them to scan your Jeep for codes. Nearly all major auto parts store offer this service for free. Failure of the oxygen sensor is a common problem, but the part can be changed at home, saving you a major repair bill. The oxygen sensors are in the exhaust pipe between the engine and the catalytic converter on the Jeep Wrangler. You will need a special socket to remove the oxygen sensor, available at most auto parts stores and tool supply stores.

Instructions

1

Lift the Jeep with a jack and support it on all four corners with a set of jack stands. The oxygen or O2 sensors are in the exhaust under the middle of the Jeep, so you will have to lift the entire Jeep to access them effectively.

2

Locate the two O2 sensors in the exhaust system. The first one is near the center of the transmission, and the second is between the resonator and the catalytic converter. Unplug the wiring harness connectors from both sensors by lifting the locking tab with a small flat screwdriver and pulling them from the harness.

3

Remove the O2 sensors, one at a time, using a oxygen sensor socket and a ratchet. Turn the sensor counter-clockwise to remove it from the exhaust. Discard the old sensor.

4

Install the two new sensors into the threaded sections of the exhaust where you removed the old ones from. The two sensors used by Jeep are identical, so either one is fine in each hole.

5

Tighten the sensors with an oxygen sensor socket and a torque wrench to 22 foot-pounds. Do not use thread locker, anti-seize or any other compound on the threads of the sensor.

6

Insert the wiring harness connectors on both sensors into the plugs on the wiring harness. Verify that they lock into the connector by checking the tab to see that it is engaged.

7

Remove the jack stands and lower the Jeep to the ground. Test run the engine and check your CEL or check engine light to ensure it has gone off.

The oil pan or oil level sensor in your Mazda MPV monitors the amount of oil in the oil pan. The sensor has an electrical connection that enables it to communicate with the PCM (power control module). When the oil level reaches or falls beneath the sensor, it illuminates the oil light in your MPVs dash cluster. Damage to the oil level sensor most often results from electrical failure. You can located and replace the oil pan sensor on your 1990 Mazda MPV right at home. The job should take you approximately 30 minutes.

Instructions

1

Place a wheel block firmly into position behind both of your MPVs rear tires.

2

Apply the emergency brake and raise the front end of your vehicle with a hydraulic jack. The bottom of both of the front tires should visibly measure no more than 8 inches from the ground.

3

Set a jack stand behind the front tires underneath your MPVs frame rail. Lift the support arms on both jack stands to 85 percent of the height of the hydraulic jack.

4

Lower the hydraulic jack slowly while you monitor both of the jack stands. When you see that your MPV securely rests on the support arms of the jack stands, stop lowering the hydraulic jack. Do not completely remove or lower the hydraulic jack. Leave it in its position for extra support.

5

Slide under your Mazda MPV and locate its oil pan. The oil pan sits at the lower, rear of the engine. It looks like a black, metal rectangle and has 20 small bolts around its upper lip. The oil pan also has a large bolt at the bottom of it used to drain the oil.

6

Locate the oil pan sensor on the lower side of your oil pan. You will not be able to see the sensors length but you should see the wiring harness connected to the top of it. On some models of the 1990 Mazda MPV, the sensor mounts just above the oil draining bolt. On other models, the sensor mounts on the opposite side of the oil pan across from the oil draining bolt.

When an oxygen sensor fails in your 1999 Ford Explorer, it is like pouring money into your gas tank. Your gas mileage will decrease substantially, and your Check Engine light may illuminate. If you have a bad oxygen sensor, you should replace it right away. One sensor is located on each side of the exhaust manifold. You can buy new sensors at an auto parts store.

Instructions

1

Lift the truck with a jack and secure it on jack stands. Move the jack out of the way once the truck is stable on the jack stands.

2

Pull the wiring harness connection apart at the top of the oxygen sensor. The connector will simply pull apart.

3

Remove the oxygen sensor with an oxygen sensor socket and ratchet. Discard the old sensor as you will no longer need it.

4

Insert the new sensor, threading it by hand to start it. Torque it to 30 pound-feet with your torque wrench.

5

Press the wiring harness connection into place on the new sensor. The connector should click when it engages fully.

6

Repeat the steps on the remaining oxygen sensor if necessary. Raise the truck with the jack enough to remove the jack stands. Return the truck to the ground.

An exhaust gas temperature (EGT) sensor is a device used to measure a car engines air-fuel ratio. It often is used on high-performance vehicles, particularly those that have turbocharged engines.

Purpose

The EGT sensor monitors the temperature of the exhaust system of certain internal combustion engines, specifically those that are turbocharged for high performance, like the Subaru WRX.

Placement

The EGT sensor can be placed before the turbo, where it measures the temperature of air as it enters the turbine, or after the turbo, where it measures the temperature of the exhaust.

Importance

High engine temperatures in an engines combustion chamber can cause detonation, resulted in melted valves and pistons, and generally destroying the engine. The EGT sensor can warn the operator of dangerously high temperatures, thus preventing fatal engine malfunction.

You can save money by replacing the oxygen sensor in your Honda CRV and avoiding a trip to the repair shop. The key is to use the correct tools for the job and to gain the know-how. Although it sounds complicated, swapping out the sensor is a step-by-step process that can be done in your driveway or garage. The purpose of the oxygen sensor is to measure the emission levels and ensure that your CRV is operating within normal limits. If your oxygen sensor is not operating properly, the "Check Engine" indicator will light up on your dashboard.

Instructions

1

Confirm that your oxygen sensor has to be replaced by taking your Honda CRV to an auto parts store that has a code machine. Technicians can hook up your CRV to their machine to get a code to confirm that your oxygen sensor is faulty. There usually is no fee for this service.

2

Purchase your oxygen sensor. The model number will depend on the year of your CRV. An auto parts store can assist you in obtaining the correct part.

3

Acquire an oxygen sensor wrench. You can rent one from a tools rental store or an auto parts store, if you dont have one or dont want to purchase one.

4

Drive your car onto auto ramps and set the parking brake, or jack it up so that you can get underneath the car to work.

5

Locate the two oxygen sensors. One is at the front and one at the back of the catalytic converter. The code that you had detected earlier indicates the faulty sensor. Or you could replace both.

6

Disconnect your negative battery cable.

7

Unscrew the bracket holding the sensors in place. This will allow access to the sensors.

8

Remove the sensor by using the oxygen sensor wrench. If the sensor is difficult to remove, you can warm up the engine by running it for a few minutes or you can spray the sensor with a lubricant.

9

Put the new sensor in place and tighten the bracket holding the sensors.

10

Reattach the negative battery cable.

11

Drive your car five to 10 miles after completing the job. This will cause the Hondas "Check Engine" light to reset.

The Chevy Tahoe was introduced in 1995, and it is a relative to the Yukon--the GMC version of the SUV. The Tahoe basically replaced the full-sized Chevy Blazer. Available since 1996 with V8 engines, the Tahoe features four O2 sensors (also known as oxygen sensors). There are two of these sensors located in front of the catalytic converter, and they are designed to monitor the fuel and air ratio mixture in the exhaust. Two more sensors are located near each converter, and serve to monitor their efficiency. One or more of these sensors can become defective and will need replacement.

Locating the Faulty Sensor

When an oxygen sensor fails, the "Service Engine Soon" light will illuminate on the dash. Take your Tahoe to an auto parts store to get the on-board computer scanned. Auto parts stores will perform this service for free, and they can help you determine which sensor(s) have failed. Since there are four sensors on most Tahoes, the scanner will be able to detect which one by reading the "check engine" codes: Bank 1, sensor 1 is the upstream sensor on the cylinder 1 side of the exhaust system; bank 1, sensor 2 is the downstream sensor on the cylinder 1 side; bank 2 sensor 1 is the upstream sensor on the opposite side of cylinder 1; and bank 2, sensor 2 is the downstream sensor on the same side.

Purchase direct-fit sensor(s). Direct-fit sensors integrate the plug-in outlet, therefore no rewiring is required. These sensors cost slightly more than universal sensors. Also, universal sensors require eliminating the male and female plug counterparts from the wire harness. Direct-fit sensors, however, do not require any wire splicing--they simply plug in to the existing wire harness connection.

Replacing the Sensor

Warm the engine up for a couple of minutes before you attempt to replace the sensor. This will expand the metal and make removing the sensor much easier. While the engine is running, spray a large amount of lubricant along the threaded joint of the faulty sensor(s) and allow it to soak in.

Disconnect the wire harness outlet from the sensor. The wire from the sensor runs about seven to eight inches from the sensor, and it is retained by a plastic clip, to prevent it from contacting the hot exhaust system.

Use a 22-mm combination hand wrench or an oxygen sensor socket and ratchet to remove the sensor. If using a wrench, insert the disconnect sensor wire through the box-end side of the combination wrench. If using an O2 sensor socket, insert the wire into the slot on the side of the socket. Turn the sensor counter-clockwise until it is loose. The sensors only have four to five threads, so it wont take much to loosen them enough to be removed by hand.

Apply a very light coat of anti-seize compound to the threaded section of the new sensor. Most direct-fit quality replacement sensors may already have a light coat on the threads. Be sure, if you have to add some on, that you do not get any on the thimble-shaped sensor--only a very light coat on the threads.

Thread the sensor into the port by hand at first, so that you dont cross-thread it. Tighten the sensor snugly with the wrench or socket and ratchet, but be careful not to over-tighten it. Since it only has four to five threads, sensors are very easily stripped out by over-tightening.

Plug the wire harness connection back together and re-secure the wire to the plastic retaining clip.

Resetting the Check Engine Light

Bring the Tahoe back to the parts store that sold you the O2 sensor(s) and scanned the trouble code for you. They will usually offer to reset the "Service Engine Soon" light for you. However, once the sensor(s) have been replaced, the computer will detect the new component and begin running through an inspection and maintenance (IM) self-diagnostic mode. This may take a few driving cycles to perform, as the engine needs to heat up and cool down repeatedly. Once the IM monitors have completed the self-diagnostic and detected that the new replacement sensor is performing its intended task, the on-board computer will turn off the "Service Engine Soon" light.

Making its debut in 1998, the Toyota Sienna has always featured at least three oxygen sensors, due to the employment of its V-engine. A V-engine is shaped like a V and has an exhaust manifold on each side. Two upstream oxygen sensors monitor the fuel to air ratio before the exhaust hits the catalytic converter. Another sensor is installed in or to the rear of the converter to monitor its efficiency. If the Sienna features two converters, there will be four sensors installed on the minivan. One for each manifold and one for each converter.

Finding the Right Sensor

When an oxygen sensor fails, it will trigger the malfunction indicator light (commonly known as the check engine light) on the instrument panel. Either read the diagnostic trouble code (DTC) with a scan tool or have it read at a local auto parts store. Most all scanners will reveal a DTC(s) with a letter and a number. This specific trouble code number can either be revealed with a brief description by the scanner or may have to be looked up in a on-board diagnostic trouble code list.

Any code that reveals a "sensor 1" problem will indicate it is one of the upstream sensors near the manifold. "Sensor 2" codes will reveal the problem is in the downstream sensor near the converter.

Bank locations are trickier, but not overly complicated. To locate "Bank 1, Sensor 1" simply find where the number one, three and five cylinders are on your Sienna. "Bank 2, Sensor 2" would indicate a problem with the downstream sensor on the number two, four and six cylinder side of the engine.

Replacing the Sensor(s)

While its not a bad idea to replace all the sensors when one fails, sometimes its financially burdening. This is where finding the right sensor comes into play. The front and rear sensors are not the same part numbers and are not interchangeable.

To replace the front sensor(s), lift the front end or the entire vehicle to gain access to the undercarriage of the exhaust system. Locate the sensor and disconnect the wire harness. Use a small screwdriver to depress the locking plug connection if necessary.

Next, use a 22mm wrench or an oxygen sensor socket and suitable ratchet. Sometimes on the front sensors, its difficult to get one tool or another onto them, so use what works best for you. Spray the threads of the sensor with a copious amount of lubricant spray, such as WD-40 or PB Blaster and allow it to soak in for a few minutes. Use the wrench or ratchet to loosen the sensor by turning it counterclockwise. A box-end wrench would work best because an open-end wrench could mar the hex-head shape of the sensor. Simply insert the detached wire through the box-end of the wrench before applying it to the hex-head. The oxygen sensor socket uses a slit down the side of the socket that accommodates the wire. Once the sensor is loose enough, finish removing it by hand.

The rear sensors are easier to access than the actual sensor, but Toyota places the plug connection under the carpet beneath the front seats. This requires opening the door and then removing the bottom door trim panel with a screwdriver. Set aside and reach underneath the carpet and towards the floorboard and then under the seat to obtain the plug. Once disconnected there, return to the undercarriage and simply pull the rubber gasket plug out from the floor board of the Sienna. The gasket holds the wire in place and prevents water from getting into the floor of the cab.

Once the wire is released, remove the oxygen sensor as you would have or already did the front ones.

Universal or Direct-Fit

There are two types of replacement sensors. Many companies try to promote the fact that youll save you money by purchasing universal sensors. These sensors require eliminating the plug connection on both sides of the wire harness. Next, match the wire colors up (which do not always match to the OEM wire harness) and butt connect. Since the rear sensors of the Sienna plug underneath the front seat and carpet, remove the seat to get enough room to perform this.

Compare the prices of the direct-fit sensors before deciding to save money with the universal. You might even find the direct-fit ones cheaper or a couple bucks more.

The parking distance control option on BMWs 2011 X5 truck uses ultrasound sensors integrated into the bumpers to aid in maneuvering tight spaces, such as for parking. The PDC sensors detect objects within 7 feet of the X5, and depending on the PDC option, emit an audible proximity warning, as well as visual warning on the control display panel in the middle of the dashboard above the vents. Replace a sensor in the case of a malfunction as indicated on the control display.

Instructions

Front Sensors

1

Park the vehicle level ground. Set the parking brake. Open and raise the hood.

2

Remove the five bumper trim screws from the area just forward of the radiator using a nut driver. Remove the eight bumper trim screws from the bottom edge of the bumper.

3

Remove the two screws from the outer edge at the bottom front of each wheel arch trim using a nut driver. Unsnap the bumper trim catch from the wheel arch trim on both sides.

4

Release the bumper trim catches located on both sides of the bumper trim just below the driving light and at the upper corners of the trim next to the narrow grille strip in the middle

5

Separate the trim from the vehicle slightly and disconnect the electrical connector from the PDC sensor transducers located on the front of the trim just below the inboard passenger trim catch and on each side of the trim. Have a second person help you pull the trim straight forward and off the vehicle.

6

Disconnect the forward transducer holder from the four retaining lugs on the trim. Remove the transducer. Ensure that the rubber ring properly seats on the new transducer. Install the new transducer on the trim and be sure that it seats correctly.

7

Remove the rubber boots from the side transducers. Unclip the transducer retainers and pull the transducer out of the holders. Install the new transducers in the holders. Ensure that the rubber ring properly seats on the transducer and that the transducer properly seats in the holder.

8

Hold the trim in place just forward of its installed position with the aid of a helper. Connect the electrical connectors to the transducer terminals. Install the rubber boots on the transducers. Push the trim piece fully into position and engage the four front clips and the two side clips. Install all of the retaining screws and tighten securely using a nut driver.

Rear Sensors

9

Locate the four transducers in the rear bumper. Two are located right over the exhaust pipes and two are below each corner of the license plate.

10

Lie on the ground and reach up behind the rear bumper. Disconnect the sensors electrical connector from its transducer terminal.

11

Unsnap the retaining tabs from the transducer and pull it from its holder.

12

Install the new transducer in the holder and engage the retaining tabs. Ensure that the rubber ring properly seats on the transducer and that the transducer properly seats in the holder.

13

Plug the electrical connector into the transducer terminal.

Ford uses a neutral start sensor -- also called the transmission range sensor or transmission position sensor -- on the 1999 F-150 trucks equipped with automatic transmissions. The TR sensor, located on the driver side of the transmission around the manual control lever shaft, controls the function of the reverse lights and interrupts the starter circuit between the ignition switch and the starter relay unless the transmission is in Park or Neutral. You will need to align the sensor after installation to ensure proper operation.

Instructions

1

Park the truck on level ground. Set the parking brake and chock the rear wheels. Place the transmission in the Neutral position. Raise the front of the truck with a jack and support it using jack stands.

2

Locate the sensor on the driver side of the transmission behind the shift control cable and the manual control lever shaft. Lift the locking tab on the electrical connector and unplug the connector from the sensor.

3

Remove the shift control cable retainer from the control lever. Slide the control cable off the pin on the control lever.

4

Hold the shift control lever in position and remove the control lever shaft nut using a ratchet and socket. Remove the shift lever from the lever shaft and discard the old nut.

5

Remove the sensor retaining bolts using a ratchet and socket. Remove the old sensor.

6

Install the new sensor and start the sensor retaining bolts. Do not tighten the retaining bolts at this time.

7

Position the sensor alignment tool above the control lever shaft with the single prong up and the double prongs down. Insert the double prongs into the two detents in the sensor collar around the control lever shaft. Rotate the collar using the alignment tool until the upper single prong fits into the detent at roughly the 10 oclock position on the upper edge of the sensor case. Remove the alignment tool.

8

Tighten the sensor retaining bolts to 62 to 89 inch-pounds using an inch-pound torque wrench and socket.

9

Install the manual control lever shaft and a new control lever shaft nut (included with new sensor). Hold the control lever in position and tighten the nut to 22 to 26 foot-pounds using a foot-pound torque wrench.

10

Place the shift lever in the passenger cab in the Overdrive position. Install the shift lever control cable and retainer on the shift lever.

11

Snap the sensor electrical connector on the sensor terminal.

12

Lower the truck to the ground and place the shift lever in the Park position. Remove the wheel chocks and check for proper reverse light operation before driving the truck.

The oxygen sensors in your car perform several duties. Their primary function is to monitor and adjust your vehicles fuel mixture so that it gets the best possible fuel mileage while emitting the least amount of toxic emissions. Most vehicles have several oxygen sensors installed throughout the fuel system and engine, so the term "bank one" or "bank two" is used to identify the location of the sensor.

Age

No car part is built to last forever, and that is true for oxygen sensors as well. Over time, normal wear and tear can cause your oxygen sensor to fail. Common causes include the gases from engine emissions and buildup of naturally occurring engine deposits.

Chemicals

Oxygen sensors can be damaged by bad gas, leaded gas, internal coolant leaks, burnt oil and even products that have been applied to other parts of the engine to fix problems, such as gasket sealers. Oxygen sensors are really only meant to be exposed to good quality fuel, so other additives or chemicals can cause them to stop functioning properly.

Heating Circuit

Most modern O2 sensors have an electrical heating circuit built into the sensor. If the electrical heating circuit malfunctions or fails, it is not uncommon for the entire oxygen sensor to fail.

The 2002 Hyundai Sonata has two oxygen sensors along the exhaust. There is one sensor beside the manifold and one sensor near the catalytic converter. These sensors regulate the cars fuel consumption based on the amount of oxygen in the exhaust. If the car is inexplicably burning more fuel than usual or the "Check Engine" light is on, it may have a bad oxygen sensor. You can access and change the sensors easily at home. Buy replacement oxygen sensors from an auto parts store.

Instructions

1

Raise the car with a jack and rest it on a stable set of jack stands. Remove the jack once the jack stands are secure.

2

Locate the oxygen sensor protruding from the manifold or exhaust pipe. Pull the electrical connection free by pressing down on the retaining clip and pulling the connector straight out.

3

Remove the oxygen sensor with an oxygen sensor socket and ratchet. Discard the old sensor.

4

Apply a small amount of anti-seize compound to the threads of the new sensor. Do not get any anti-seize compound on the tip of the sensor. Thread the new sensor in carefully by hand. Tighten it with an oxygen sensor socket and ratchet. Torque the sensor to 40 pound-feet with a torque wrench.

5

Plug the electrical connection into the connector on the oxygen sensor. Repeat the process on the second sensor if necessary.

6

Raise the car slightly with the jack and remove the jack stands. Lower the car to the ground.

If the 1993 Honda Accord check engine light comes on and the car is using an abnormal amount of fuel, the car may have a bad oxygen sensor. The sensor in the 1993 Accord is threaded into the exhaust manifold, just beneath the engine compartment. Buy a replacement sensor from an auto parts store and change it at home to save on wasteful fuel expenses over time.

Instructions

1

Raise the Accord with a jack until it is high enough to place a set of jack stands underneath it to support it.

2

Disconnect the wiring connection on the oxygen sensor by pulling the plastic connectors apart. Unthread the sensor with a wrench.

3

Thread the replacement sensor by hand until it is just barely tight. Torque the sensor to 33 pound-feet with a torque wrench.

4

Connect the wiring connection by pressing it together. The connector will click when it locks. Lift the car with the jack enough to remove the jack stands. Return the car to the ground.

If the Check Engine light has come on in your 2001 Mitsubishi Galant, the oxygen sensor may be to blame. An oxygen sensor regulates the air-to-fuel mixture based on how much oxygen the sensor detects in the exhaust. If a sensor fails, your fuel consumption may increase noticeably, and youll want to replace it immediately. You can replace it yourself. The oxygen sensor is located on the exhaust manifold, accessed from beneath the truck. Buy a new sensor from an auto parts store.

Instructions

1

Raise the front of your 2001 Galant with a jack and support it on a set of jack stands. Remove the jack once the car is secure on the jack stands.

2

Be sure the engine is cool. Slide under the Galant. Disconnect the electrical connection from the oxygen sensor. The sensor protrudes from the exhaust manifold with the wiring harness connected to the top of the sensor. Press the retaining clip in while pulling the connector free.

3

Remove the oxygen sensor from the manifold using an oxygen sensor socket and a ratchet. Discard the old sensor.

4

Insert the new oxygen sensor and thread it by hand until tight. Torque the sensor to 30 pound-feet with your torque wrench. Press the electrical connection into place until it clicks.

5

Raise the car slightly with the jack and remove the jack stands. Lower the car to the ground and remove the jack.

The Mazda Miata contains two oxygen sensors. The sensors are located on each end of the catalytic converter; they help control the fuel consumption based on the amount of oxygen in the cars exhaust system. If the "check engine" light has come on, or if your cars gas mileage has decreased, change the sensors to ensure that your vehicles emissions ratings and fuel budget stay low.

Instructions

1

Start the Miatas engine and let it warm up. Turn off the engine and remove the key from the ignition. Raise the Miata with a jack. Rest the car on a set of jack stands. Locate the oxygen sensors on either side of the catalytic converter.

2

Press in the locking tab to release the wiring harness connection. Pull the connectors apart. Remove the sensor with a ratchet and oxygen sensor socket.

3

Thread the new sensor in its place, by hand, until it is secure. Tighten it with a ratchet and oxygen sensor socket. Press the wiring harness connection into place.

4

Raise the car with the jack to remove the jack stands from beneath the car. Lower the Miata to the ground.

The throttle position sensor is an electronic sensor that plays an important role in assuring efficient engine operation. Without a properly functioning throttle position sensor, an automobile may experience a number of problems.

Purpose

The throttle position sensor measures and reports the amount of throttle opening to the engine control computer. The computer uses this information to make adjustments to the mixture of fuel and air used for combustion. As the throttle is opened, the engine requires more fuel in the mixture to provide needed power.

Problem Signs

When a throttle position sensor begins to fail, the engine will often hesitate during acceleration as the sensor is not properly reporting the change in the amount of throttle opening. A faulty throttle position sensor may also cause other problems including stalling, rough idle and an increase in fuel consumption.

Troubleshooting

Problems from the throttle position sensor often trigger a diagnostic fault code. A diagnostic code reader can be used to read the fault codes to locate the source of the problem. Before replacing the sensor, the sensors wiring should be inspected for damage or loose connections. The sensor may also become loose causing the readings to be inaccurate.

Replacing the oxygen (O2) sensor in your 2000 Honda Civic can improve the vehicles idle, fuel economy and engine performance. The O2 sensor reads the percentage of oxygen in the exhaust gases as they exit the engine, then converts that information to milliamps--these are used by the engine management computer to adjust the air/fuel mix going into the engine. If a sensor fails, the engine will run very rough and even stall during driving.

Instructions

1

Raise the front of the car with a jack, then support the car on a set of jack stands. Slide under the car, just behind the front wheels, and locate the O2 sensor on the catalytic converter.

2

Disconnect the electrical connector on the O2 sensor pigtail from the connector on the main wiring harness by releasing the locking tab and separating the two halves. Place an O2 sensor socket on the sensor, then turn it counterclockwise with a ratchet, removing the sensor from the catalytic converter.

3

Insert a new O2 sensor into the threaded hole in the catalytic converter and turn it clockwise, using an O2 sensor socket and ratchet to tighten it. Connect the wiring harness connector on the car to the pigtail connector on the O2 sensor, pushing them together until the locking tab snaps in place.

4

Slide out from under the car, raise the car off the jack stands with a jack, then remove the stands from under the car. Lower the jack, setting the car on the ground, then remove the jack from under the car.