Auto Service

1. Jack up on the front of your Audi A4 under the front jack point behind the radiator, using the floor jack.
2. Place jack stands under the front pinch welds of the vehicle and lower the Audi onto the stands.
3. Climb under the vehicle and disconnect the electrical connector from the oxygen sensor.
4. Unbolt the oxygen sensor from the exhaust using an O2 sensor socket and socket wrench.
5. Remove the sensor and thread the new sensor into the exhaust. Tighten the sensor using a socket wrench and O2 sensor socket.
6. Reconnect the electrical leads to the sensor.
7. Lower the A4 to the ground using the floor jack.

1. Open the Audis hood. The intake air temperature sensor is always going to be on the intake manifold, near the air filter box.
2. Find the air duct and follow it to the air filter box.
3. Look to the left of the air duct, where it meets the air filter box. The sensor is screwed into the intake in the corner where the air duct meets the air box.