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S3 engine running lean

Discussion in 'A3/S3 Forum (8L Chassis)' started by Mattjbradbury, Dec 7, 2010.

  1. Mattjbradbury
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    Mattjbradbury Member

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    Hi guys.

    My engine management light keeps coming on (then switching itself off a couple of days later) but its currently in the garage getting a boot catch replaced and they have informed me this is because the engine is running lean. (They only ran a initial diagnostic, they don't know why and i'm not prepaired to pay loads to fix it just before xmas!)

    On the MOT it almost failed on emissions until they put cleaning agent through the engine. I think the 2 are related. Any other people had issues with this and the cause and possible fix?

    Thanks,

    Matt
    #1
  2. jcb
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    jcb Active Member

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    you need a VAGCom scan.
    could be something as simple as a crapped out MAF

    why did they put a cleaning agent through it if they hadnt done a full scan?
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  3. Mattjbradbury
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    Mattjbradbury Member

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    Sorry the MOT was done a couple of months ago before the engine light started coming on... and the quick fix was cleaning agent rather than a Scan and it passed the MOT after the agent.
    #3
  4. finesse
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    finesse Active Member

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    the error code from the garage would be good, read these

    wiki.ross-tech.com/wiki/index.php/Fuel_Trim_Info


    Taken from the Ross - Tech Wiki
    17536 / P 1128 /004392 - Fuel Trim ; Bank 1
    ( Mult) : System too Lean
    Possible Symptoms
    Malfunction Indicator Light ( MIL ) active
    Possible Causes
    Mass Air Flow ( MAF ) Sensor faulty
    Oxygen Sensor Control faulty
    Oxygen Sensor ( s ) faulty
    Fuel Injector ( s ) faulty
    Possible Solutions
    Check Mass Air Flow (MAF ) Sensor
    Check Oxygen Sensor Control
    Check Oxygen Sensor ( s )
    Check Fuel Injector (s )
    #4
  5. Mattjbradbury
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    Mattjbradbury Member

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    Thanks guys. So its likely to be a sensor fault. Already had a thermostat sensor fault on the car, they seem to go down like flies!
    #5

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