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Thread: Golf 4 Engine Fault Code Explanation - System Too Lean

  1. #1
    Join Date
    Jun 2009
    Location
    Eastwood, NSW
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    Golf 4 Engine Fault Code Explanation - System Too Lean

    G'day,

    Hooked up VCDS to my daughter's 2003 model 2.0 litre Golf 4 to see why it was consuming around 20 litres/ 100km. Got the following engine codes. I guess the engine ECU is over-compensating for the lean fuel mixture, hence the high fuel consumption. If I disconnect the battery for more than 15 mins, the fuel consumption improves to around 8.5 litres/100km (but then gradually deteriorates until the next battery reset).

    What do you think is the cause? Is there a code preset that can be done to fix the fuel mixture fault? Thanks..

    Address 01: Engine Labels: 06A-906-018-AQY.lbl
    Part No: 06A 906 018 GP
    Component: 2.0l R4/2V MOTR AT V01
    Coding: 00033
    Shop #: WSC 01271
    VCID: 76E3F91F52E30AAEB1B-4AE8

    2 Faults Found:
    16555 - Fuel Trim; Bank 1
    P0171 - 35-10 - System Too Lean - Intermittent
    17536 - Fuel Trim; Bank 1 (Mult)
    P1128 - 35-10 - System too Lean - Intermittent
    Readiness: 0000 0000

  2. #2
    Join Date
    Dec 2008
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    Look for splits in the intake pipe, breather hoses and vacuum hoses.

    The O2 sensor(s) are picking up a lean mixture after the air mass sensor.
    '07 Transporter 1.9 TDI
    '01 Beetle 2.0

  3. #3
    Join Date
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    If no air leaks the No1 02 sensor and airmass meters are common on these models...replaced so many....VDUB..
    VOLKSWAGEN TECHNICIAN - 16 YEARS OF PAIN..
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  4. #4
    Join Date
    Jun 2009
    Location
    Eastwood, NSW
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    Thanks, guys..much appreciated..

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