When to replace the Lambda Sensor on your MERCEDES-BENZ A-CLASS
Recommended replacement interval for the part category Lambda sensor : 100000 km
This replacement procedure can be used for:
MERCEDES-BENZ A-Class (W168) A 140 (168.031, 168.131) 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 A-Class (W168) and other MERCEDES-BENZ models
Replacement: lambda sensor – MERCEDES-BENZ A-CLASS (W168). Tools you need:
Wire brush
WD-40 spray
Electronic spray
High-temperature ceramic grease
Torque wrench
Combination spanner #22
Drive socket # 8
22-mm oxygen sensor socket
Ratchet wrench
Thread tap
Fender cover
Replacement: lambda sensor – MERCEDES-BENZ A-CLASS (W168). 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.
  • All work should be done with the engine stopped.
Replacement: lambda sensor – MERCEDES-BENZ A-CLASS (W168). Recommended sequence of steps:
  1. Step 1
    Before getting down to work, start the engine and let it warm up to operating temperature.
    Step 2
    Open the bonnet.
    Step 3
    Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.
    Step 4
    Shut off the engine.
    Step 5
    Lift the car using a jack or place it over an inspection pit.
    Step 6
    How to change Lambda Sensor on Mercedes W168 1997 - free PDF and video manuals
    Undo the fasteners of the oil pan lower cover. Use a drive socket #8. Use a ratchet wrench.
  2. Step 7
    How to replace MERCEDES-BENZ A-Class (W168) A 140 1.4 (168.031, 168.131) 1998 Lambda Sensor - step-by-step manuals and video guides
    Remove the oil pan cover.
  3. Step 8
    Mercedes W168 A 170 CDI 1.7 (168.009, 168.109) 1999 Lambda Sensor replacement: free workshop manuals
    Detach the oxygen sensor connector.
  4. Step 9
    Changing Lambda Sensor on MERCEDES-BENZ A-Class (W168) A 170 CDI 1.7 (168.008) 2000 by yourself
    Clean the oxygen sensor fastener. Use a wire brush. Use WD-40 spray.
  5. Step 10
    How to remove MERCEDES-BENZ A-CLASS A 190 1.9 (168.032, 168.132) 2001 Lambda Sensor - online easy-to-follow instructions
    Unscrew the oxygen sensor fastener. Use a 22-mm oxygen sensor socket. Use a ratchet wrench.
  6. Step 11
    How to replace Lambda Sensor on MERCEDES-BENZ A-Class (W168) 2002: download PDF manuals and video instructions
    Remove the oxygen sensor.
  7. Step 12
    How hard is it to do yourself: Lambda Sensor replacement on Mercedes W168 A 160 CDI 1.7 (168.006) 2003 - download illustrated guide
    Cut the thread for the new oxygen sensor. Use a thread tap. Use a ratchet wrench.
  8. Step 13
    Need to know how to renew Lambda Sensor on MERCEDES-BENZ A-CLASS 2004? This free workshop manual will help you to do it yourself
    Treat the oxygen sensor. Use high-temperature ceramic grease.
  9. Step 14
    Changing of Lambda Sensor on Mercedes W168 1997 won't be an issue if you follow this illustrated step-by-step guide
    Install the new oxygen sensor.
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DIY MERCEDES-BENZ A-Class (W168) Lambda Sensor replacement - online guide
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