Audi o2 sensor replacement

In this guide, we will explain audi o2 sensor replacement in detail.This article focuses on the replacement of the front oxygen sensor on the catalytic converter.If you need to replace the rear oxygen sensor behind the catalytic converter, you may need to use tools such as jacks, ramps, lifters, or just seek the help of a professional service technician.

Symptoms

・Engine malfunction light comes on
・Decrease in fuel economy (increase in gas mileage)
・Delayed engine response or misfire
・Irregular idling condition

Operating instructions

1. Open the engine compartment
Park your Audi vehicle on a safe, level surface, put it in neutral and apply the handbrake, open the hood and wait for the engine to cool completely.
2. Disconnect the negative battery terminal
Locate the battery and disconnect the negative cable connection.

3. Locate the oxygen sensor
Refer to the accompanying diagram:

Audi Q5 Oxygen Sensor Location Diagram

Audi A4 Oxygen Sensor Location Schematic
4 . Remove the oxygen sensor plug

Press the connecting plug catch of the oxygen sensor to unplug and disconnect the plug.

5. Remove the old oxygen sensor
Place the special sleeve for the oxygen sensor over the sensor and remove the old sensor by turning it counterclockwise to loosen it.If the sensor is stuck due to rust and corrosion problems common to high mileage vehicles, spray penetrating oil and let it sit for at least 10 minutes to fully lubricate before proceeding, do not force it to be removed.

6. Install the new oxygen sensor (O₂ sensor)
Align the new Audi oxygen sensor to the mounting position, pre-tighten it by hand, and then tighten it with a torque wrench according to the manufacturer's recommended torque, avoiding damage to the threads by excessive force.
7. Connecting the Sensor Harness
Insert the harness plug of the new sensor accurately into the corresponding socket of the vehicle and make sure the connection is firm and not loose.
Note: If you are using a universal oxygen sensor, you will need to identify and connect the wires according to the wiring diagram that came with the sensor.

audi o2 sensor replacement cost

It usually costs less than $200 to replace an Audi oxygen sensor yourself.
Replacing an Audi oxygen sensor at a dealer or repair store costs between $300 and $550.

audi o2 sensor replacement cost reference (data from RepairPal)

For reference, some auto repair websites give the estimated cost of replacing the oxygen sensors of different Audi models in different years, and the following data comes from RepairPal.

APPLICABLE MODELS
This audi o2 sensor replacement guide is for Audi A1, A3, A4, A5, A6, A7, Q3, Q5, TT models.