When to replace the Lambda Sensor on your AUDI A4
Recommended replacement interval for the part category Lambda sensor : 100000 km
Important!
This replacement procedure can be used for:
AUDI A4 Avant (8E5, B6) 2.0, AUDI A4 Avant (8E5, B6) 1.8 T, AUDI A4 Avant (8E5, B6) 3.0, AUDI A4 Avant (8E5, B6) 2.4, AUDI A4 Avant (8E5, B6) 1.8 T quattro, AUDI A4 Avant (8E5, B6) 3.0 quattro, AUDI A4 Avant (8E5, B6) 2.0 FSI, AUDI A4 Avant (8E5, B6) 1.8 T, AUDI A4 Avant (8E5, B6) 1.8 T quattro, AUDI A4 Avant (8E5, B6) 2.4, AUDI A4 Avant (8E5, B6) 1.8 T, AUDI A4 Avant (8E5, B6) 1.8 T quattro, AUDI A4 Avant (8E5, B6) S4 quattro, AUDI A4 Avant (8E5, B6) 3.0, AUDI A4 Avant (8E5, B6) 3.0 quattro 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 A4 Avant (8E5, B6) and other AUDI models
Tools
Replacement: lambda sensor – AUDI A4 Avant (8E5, B6). List of the tools you'll need:
Wire brush
WD-40 spray
Electronic spray
High-temperature ceramic grease
Torque wrench
Drive socket # 10
22-mm oxygen sensor socket
Thread tap
Ratchet wrench
Replacement: lambda sensor – AUDI A4 Avant (8E5, B6). 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 – AUDI A4 Avant (8E5, B6) – should be done with the engine switched off.
Carry out replacement in the following order:
  1. Step 1
    Lift the car using a jack or place it over an inspection pit.
    Step 2
    How to change Lambda Sensor on Audi A4 B6 Avant 2001 - free PDF and video manuals
    Unscrew the fasteners of the oxygen sensor housing cover. Use a drive socket #10. Use a ratchet wrench.
  2. Step 3
    How to replace AUDI A4 Avant (8E5, B6) 1.9 TDI 2002 Lambda Sensor - step-by-step manuals and video guides
    Remove the oxygen sensor housing cover.
  3. Step 4
    Audi A4 B6 Avant 2.5 TDI quattro 2003 Lambda Sensor replacement: free workshop manuals
    Detach the oxygen sensor connector.
  4. Step 5
    Changing Lambda Sensor on AUDI A4 Avant (8E5, B6) 1.8 T 2004 by yourself
    Disconnect the oxygen sensor wiring.
  5. Step 6
    How to remove AUDI A4 2.5 TDI 2001 Lambda Sensor - online easy-to-follow instructions
    Clean the oxygen sensor fastener. Use a wire brush. Use WD-40 spray.
  6. Step 7
    How to replace Lambda Sensor on AUDI A4 Avant (8E5, B6) 2002: download PDF manuals and video instructions
    Unscrew the oxygen sensor fastener. Use a 22-mm oxygen sensor socket. Use a ratchet wrench.
  7. Step 8
    How hard is it to do yourself: Lambda Sensor replacement on Audi A4 B6 Avant 1.8 T quattro 2003 - download illustrated guide
    Remove the oxygen sensor.
  8. Step 9
    Need to know how to renew Lambda Sensor on AUDI A4 2004? This free workshop manual will help you to do it yourself
    Clean the thread to prepare it for installing a new oxygen sensor. Use a thread tap. Use a ratchet wrench.
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DIY AUDI A4 Avant (8E5, B6) Lambda Sensor replacement - online guide
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