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3" DP Question "Lambda"

Discussion in 'A3/S3 Forum (8L Chassis)' started by S3 TAM, Feb 8, 2011.

  1. S3 TAM
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    S3 TAM Pocket now empty

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    I've got her booked in for a Downpipe & Cat @ Pipewerx.

    Is it worth changing the Lambda sensor at the same time?
    how much work is it? i.e. simple connector or loads of wiring?

    How many Sensors are there, I have seen one on the DP and one just after the CAT. is that correct.

    Cheers
    #1
  2. finesse
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    finesse Active Member

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    pre cat : 77
    post cat : 89

    ecp sell the OEM Bosch lambda

    easily done even for me. :) just need a penetration fluid

    worth changing? no
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  3. Dane
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    Dane Faster than a V12 Q7

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  4. S3 TAM
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    funny guy

    cheers for the info i might not bother, if it aint broke don't change it.
    #4
  5. finesse
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    finesse Active Member

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    you can test pre/post health through vcds to see if all is well

    will paste the guide later when home
    #5
  6. S3 TAM
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    Cheers Buddy
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  7. finesse
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    finesse Active Member

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    Block 034 - Ageing of Pre-Cat Oxygen Sensor

    Enter the Basic Settings block 034.

    Field 2 shows the Exhaus Gas Temperature, measured by the oxygen sensor. It
    must be above 350°C for the test to succeed.

    The value in field 3 is called “dynamic factor”. It is an indicator for lambda probe
    ageing. The value should be above 0.5; the value for a new sensor is ~2.0. It will
    decrease as the sensor ages.

    The field 4 will say either 'TEST OFF/ON' before/while the test is running, and
    either 'B1-S1 OK' or 'B1-S1 NOT OK' afterwards. It may take several minutes to
    obtain result of diagnosis.

    Do not continue with testing unless the field 4 is indicating “B1-S1 OK”.

    2.8.5 Block 036 - Post-Cat Oxygen Sensor Diagnosis
    Enter the Basic Settings block 036.

    The field 2 will say either 'TEST OFF/ON' before/while the test is running, and
    either 'B1-S2 OK' or 'B1-S2 NOT OK' afterwards. It may take several minutes to
    obtain result of diagnosis.

    Do not continue with testing unless the field 2 is indicating “B1-S2 OK”.

    2.8.6 Block 037 – Lambda System Diagnosis
    Enter the Basic Settings block 037.

    The value in field 2 is the post-cat lambda probe output voltage, with range of
    0.10 … 0.95V. It should remain as constant as possible. Considerable voltage
    fluctuations are an indication of catalytic converter damage. A constant voltage of
    0.450V is an indication of damaged wiring.

    The third field is lambda correction value between the pre and post-cat sensors.
    It should stay below 0.02.

    Note. If the lambda probe voltage is OK and the lambda correction value is still
    greater than 0.02, even after a test drive, this is an indication of ageing of the
    lambda probe upstream of the catalytic converter.

    The field 4 will say either 'TEST OFF/ON' before/while the test is running, and
    either 'System OK' or 'System NOT OK' afterwards. It may take several minutes
    to obtain result of diagnosis.

    Do not continue with testing unless the field 4 is indicating “System OK”.


    2.8.7 Block 043 – Ageing of Post-Cat Oxygen Sensor

    Enter the Basic Settings block 043.

    The field 4 will say either 'TEST OFF/ON' before/while the test is running, and
    either 'B1-S2 OK' or 'B1-S2 NOT OK' afterwards. It may take several minutes to
    obtain result of diagnosis.

    Do not continue with testing unless the field 4 is indicating “B1-S2 OK”
    #7

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