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Problems with a friends car (DTC's)

Discussion in 'General Technical / How To' started by cbass, Sep 3, 2004.

  1. cbass
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    cbass Member

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    [Sep 3, 2004]
    Hey guys,
    Last night, I vagged(sp?) a friend's car to find some trouble codes. The check engine light had come on a while ago, and he was wondering why. Also, he just had it chipped a few days ago (apr 2nd hand) and when he got it chipped, he said it acted really funny. Come to find out, the "really funny" was misfires happening quite a lot. Anyway, here are the fault codes that showed up in the engine control module. Any help diagnosing these is much appreciated!

    Address 01: Engine
    Controller: 4B0 906 018 P
    Component: 1.8L R4/5VT G 0008
    Coding: 07201
    Shop #: WSC 06335
    9 Faults Found:
    16486 - Mass Air Flow Sensor (G70): Signal too Low
    P0102 - 35-10 - - - Intermittent
    18010 - Power Supply Terminal 30: Voltage too Low
    P1602 - 35-10 - - - Intermittent
    17545 - Fuel Trim: Bank 1 (Add): System too Rich
    P1137 - 35-10 - - - Intermittent
    16490 - Manifold / Barometric Pressure Sensor (G71) / (F96): Implausible Signal
    P0106 - 35-10 - - - Intermittent
    16524 - Oxygen (Lambda) Sensor B1 S2: No Activity
    P0140 - 35-10 - - - Intermittent
    17536 - Fuel Trim: Bank 1 (Mult): System too Lean
    P1128 - 35-00 - -
    16684 - Random/Multiple Cylinder Misfire Detected
    P0300 - 35-10 - - - Intermittent
    16685 - Cylinder 1 Misfire Detected
    P0301 - 35-10 - - - Intermittent
    17658 - Fuel Level too Low
    P1250 - 35-00 - -
    Readiness: 0010 1001


    BTW, it's a 2000 A4 1.8T

    TIA! /ubbthreads/images/graemlins/beerchug.gif
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  3. audi5e
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    audi5e Member

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    [Sep 3, 2004]
    if he has had it chipped, then I presume you are using diagnostic software relevant for that ECU?
    VAG software is unlikely to work, unless it is a modification from Audi?
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  4. cbass
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    cbass Member

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    [Sep 3, 2004]
    Well, I have to say, I have never heard of this before, but I am using Ross-Tech's VAG-COM. Does that help?
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  5. cbass
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    cbass Member

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    [Sep 3, 2004]
    I know the MAF fault is probably related to the rich/lean faults, or the Lambda sensor fault could be related to these two also. I am mostly worried about the misfires. They were happening quite frequently. I suggested coil packs at first, but it seems to be doing it on all cyclinders and only started when he chipped it. Now, after reading up a little more, I think it might be the spark plugs.

    Any suggestions as to which spark plugs to use for a APR chipped 1.8t?
    Thanx
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  6. audi5e
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    audi5e Member

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    [Sep 4, 2004]
    I am not sure. If your friend had the chip installed then he should take the car back to the people that installed it.
    Since the problems only seem to have started AFTER the chip install, my guess is that the chip is not set up properly for the 1.8t. Phone APR and see if vag-com is compatible.
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  7. cbass
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    cbass Member

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    [Sep 20, 2004]
    Just FYI,
    He's got it mainly sorted now, turns out that the majority of the problems were coming from cheap spark plugs (he didn't get the right kind and as soon as he chipped it, it got much worse). He replaced those and all the misfires went away. He has a bad MAF, so he will be getting that replaced along with the before cat O2 sensor and that should clear up the majority of the other codes. Thanks for the help!
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