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Thread: O2 sensor fault finding - Reference material

  1. #1
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    O2 sensor fault finding - Reference material

    Might be of interest to some of you.

    Helps me get my head around sensor issues.

    Good luck

    https://www.engine-light-help.com/ox...sor-codes.html

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    Quickly reading through that they fail to mention what I find is the most common cause of rich running codes on VAG engines and that is a stuck open thermostat. This causes the engine to overcool so the ECU starts adding fuel.
    2003 Skoda Octavia VRS Estate. APR 98RON remap, APR R1 diverter valve, Jetex exhaust, K&N panel filter, 7.5x18 Alutec Monstr wheels with 225/40 18 Uniroyal Rainsport 3 tyres.
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    1988 Golf 2 GTI 16 valve, 2.2 with Weber Alpha injection
    1983 Golf 1 GTI 8 valve, 2 litre with Eurospec racing 42/36 head
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  4. #3
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    Is there a way to share the VW documents with you on faults? I have it in word, or a PNG or JPEG. It is 70 pages long unfortunately so won't paste to a post!
    2009 Passat 4Motion 3.2 FSI

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