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How to Fix an Oxygen Sensor for a Volkswagen Passat

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.