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How to change lambda sensor on CITROËN C4 Saloon N – replacement guide
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Recommended replacement interval for the part category Lambda sensor : 100000 km
Important!
This replacement procedure can be used for:
CITROËN C4 Saloon N 2.0 Flex, CITROËN C4 Saloon N 1.6 THP … View more
The steps may slightly vary depending on the car design.
CITROËN C4 Saloon N 2.0 Flex, CITROËN C4 Saloon N 1.6 THP … View more
The steps may slightly vary depending on the car design.
This video shows the replacement procedure of a similar car part on another vehicle
All the parts you need to replace – Lambda Sensor for C4 Saloon N and other CITROËN models
Alternative products

Wire brush
WD-40 spray
Electronic spray
Copper grease
Torque wrench
Combination spanner #22
22-mm oxygen sensor socket
Ratchet wrench
Thread tap
Fender cover
Replacement: lambda sensor – CITROËN C4 Saloon N. AUTODOC experts recommend:
- After replacing the oxygen sensor, clear the trouble code from the electronic control unit and let the ECU adapt itself to the new sensor.
- Before getting down to work, start the engine and let it warm up to operating temperature.
- Please note: all work on the car – CITROËN C4 Saloon N – should be done with the engine switched off.
Carry out replacement in the following order:
- Step 1Open the bonnet.Step 2Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.Step 3
Detach the oxygen sensor connector. - Step 4
Clean the oxygen sensor fastener. Use a wire brush. Use WD-40 spray. - Step 5
Unscrew the oxygen sensor fastener. Use a 22-mm oxygen sensor socket. Use a ratchet wrench. - Step 6
Remove the oxygen sensor. - Step 7
Clean the oxygen sensor mounting seat. Use WD-40 spray. - Step 8
Cut the thread for the new oxygen sensor. Use a thread tap. Use a ratchet wrench.
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