How to change an oxygen sensor | AUTODOC tips

How to change lambda sensor on a car – replacement tutorial

You will need:

                        a wire brush
                      
                        WD-40 spray
                      
                        electronic spray
                      
                        copper grease
                      
                        a torque wrench
                      
                        a combination spanner
                      
                        a lambda sensor socket
                      
                        a ratchet wrench

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Please note!

Modern cars can have from 1 to 8 lambda sensors (also called oxygen sensors).
Driving a car with a faulty lambda sensor can result in catalytic converter failure, difficulty starting the engine, poor engine performance, and increased fuel consumption.

1.

If the exhaust manifold is covered by a heat shield made from a metallised material, remove it.
2.

Warm up your engine to operating temperature so it will be easier to unscrew the lambda sensor.
3.

Remove the negative terminal from the battery. Wear gloves to protect yourself from burns.
4.

Detach the sensor's connector.
5.

Using a special socket and ratchet wrench, unscrew the lambda sensor by rotating it counterclockwise.
6.

Treat the thread of the new sensor with a special lubricant, such as high-temperature copper grease.
7.

Screw the sensor all the way in by hand.
8.

Tighten it with a torque wrench to the torque recommended by the car manufacturer.
9.

Clean the connector pins using a special spray.
10.

Attach the sensor's connector, arrange the cable properly, and secure it with clips.
11.

Reinstall the heat shield and reconnect the battery terminal.
12.

Clear the trouble code from the ECU memory.
13.

In some cases you will need to drive a certain distance for your ECU to adapt to the new sensor.

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