Checking Lambda probe ageing of Lambda probe 1 before catalytic converter — VW

🧭 Before you start

Fits: VW Passat B5 (3B)

• Special tools named: V.A.G 1551, V.A.G 1552

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• This procedure can take several minutes.
• If Lambda probe is renewed, learnt values in engine control unit must be erased .

🔧 Engine codes this applies to

📋 Procedure

1. Connect fault reader V.A.G 1551 (V.A.G 1552). Start engine and select "“Address word”" 01 of engine control unit. (Connect fault reader and select engine control unit )
2. Press keys 0 and 4 for function "“Initiate basic settings”" and confirm entry with Q key.
3. Press keys 0, 3 and 4 for "“Display group number 34”" and confirm entry with Q key.
4. Depress brake pedal and hold.
5. Depress accelerator to full throttle position.

6. Allow engine to run at increased speed until the display in display zone 4 jumps from "“Test OFF”" to "“Test ON”". The catalytic converter temperature in display zone 2 should be at least 350 °C. [Note: This procedure can take several minutes.]
7. Leave engine running at increased speed until the specification "B1S1 OK" is displayed in display zone 4.
8. Take car for a road test to free Lambda probe of any deposits, then repeat the test.
9. Renew Lambda probe 1 bank 1 before catalytic converter G39. [Note: If Lambda probe is renewed, learnt values in engine control unit must be erased .]
10. Read fault memory, if necessary, repair any faults and then clear fault memory , Reading and clearing fault memory.

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