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How to Replace an O2 Sensor on a 2001 Audi A6 4.2

2012-03-25   Views:28

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The O2 sensor on a 2001 Audi A6 4.2 monitors the exhaust gases coming out of the engine. On the Audi, the upstream sensor is mounted on the exhaust before the catalytic converter. The downstream sensor is mounted on the exhaust after the catalytic co

How to Replace an O2 Sensor on a 2001 Audi A6 4.2

The O2 sensor on a 2001 Audi A6 4.2 monitors the exhaust gases coming out of the engine. On the Audi, the upstream sensor is mounted on the exhaust before the catalytic converter. The downstream sensor is mounted on the exhaust after the catalytic converter. These sensors send information to the Audi's computer, called an ECU, and the ECU can then adjust the fuel mixture. Since the Audi A6 needs an air to fuel ratio of 14.7 parts air to 1 part gasoline, the O2 sensors need to be working properly to detect any incomplete burning (measured by the contaminates left in the exhaust) in the engine. When the sensors fail, you will notice a marked decrease in engine performance, and the "check engine" light will come on. At this point, you need to replace the O2 sensors.

Skill level:Easy

Things you need

Floor jackJack standsReplacement O2 sensorsSocket wrenchO2 sensor socketPenetrating oil (optional)

Instructions

1 Jack up the front of the vehicle using a floor jack under the front jack point behind the radiator.

2 Place a jack stand under each of the front pinch welds under the front doors and lower the A6 onto the stands.

3 Locate the O2 sensors on the exhaust. The O2 sensors look like small plugs secured to the exhaust with wires attached to them. There will be one before the catalytic converter and one after the converter on the exhaust pipe.

4 Disconnect the electrical connectors running to the O2 sensors.

5 Unscrew the O2 sensors from the exhaust using an O2 sensor socket, turning in a counterclockwise direction.

6 Thread and tighten the new O2 sensors.

7 Reconnect the electrical connectors to the O2 sensors.

8 Lower the A6 to the ground using the floor jack.

Tips and warnings

If the sensors are rusted on, you may have to apply penetrating oil to the threads and let them sit for a while, then try again.

After replacing the sensors, you may have to reset the "check engine" light.

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