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Lambda Sensor/De-cat Advice Needed

Discussion in 'A3/S3 Forum (8L Chassis)' started by dany2k, Dec 14, 2010.

  1. dany2k
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    dany2k Member

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    [Dec 14, 2010]
    Hi all,
    Hooked up my beloved to VAGCOM this morning to find the following error:

    17521 - Oxygen (Lambda) Sensor B1 S1 Internal Resistance too High P1113 - 35-10 - - - Intermittent

    My research so far tells me that this relates to the pre-cat lambda sensor: am I right or am I talking ******?

    If it IS the dear lamda sensor that has/is dying is it simply worth replacing it, or just de-catting it with the following...

    AUDI A3 96-03 20v 1.8T TURBO EXHAUST DOWN PIPE DECAT on eBay (end time 21-Dec-10 19:12:39 GMT)

    All advice greatly appreciated :)

    Regards,

    Danny
    #1
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  3. DaveA3
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    DaveA3 Audi A-Trizzle!

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    [Dec 14, 2010]
    i thought u needed the lambda sensor if u have one?
    #2
  4. dany2k
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    dany2k Member

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    [Dec 14, 2010]
    no idea dave: my idea is if a failed lambda is gonna kill the cat, i'll the cat... maybe it's a mental theory, but im sure you/somebody can clear it up :)
    #3
  5. DaveA3
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    DaveA3 Audi A-Trizzle!

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    [Dec 14, 2010]
    Last edited: Dec 14, 2010
    #4
  6. s3dave
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    s3dave TFSI Hybrid

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    [Dec 14, 2010]
    I think you will still need your lambda as this is what changes the fuelling, downstream i think can be deleted if fitted
    #5
  7. finesse
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    finesse Active Member VCDS Map User

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    [Dec 14, 2010]
    B1 S1 pre cat lambda around the manifold area

    ecp, TPS. and gfs sell them about £80....
    #6
  8. Welly
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    Welly VX220 SC Driver :)

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    [Dec 14, 2010]
    ^ Exactly what he said. B1 S1 is the pre cat lambda, and is the more expensive of the two. You will need this lambda as it is the sensor that controls fuelling adjustments.

    Post Cat lambda can be deleted and removed from the map if the cat is removed.
    #7
  9. dany2k
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    dany2k Member

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    [Dec 14, 2010]
    Hi all,
    Thanks for the input! If the B1 S1 pre-cat lambda is on the manifold... does this mean it can be accessed from the engine bay?

    Forum troll? description of the day!
    #8
  10. finesse
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    finesse Active Member VCDS Map User

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    [Dec 14, 2010]
    [​IMG]


    you can see the charge pipe and coolant tank?
    #9
  11. dany2k
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    dany2k Member

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    [Dec 15, 2010]
    wow finesse, that is a don corleone-level of reply! definitely worth a thankyou, thanks!
    #10

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