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Lambda Sensor/De-cat Advice Needed

dany2k Dec 14, 2010

  1. dany2k

    dany2k Member

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    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
     
  2. DaveA3

    DaveA3 Audi A-Trizzle!

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    i thought u needed the lambda sensor if u have one?
     
  3. dany2k

    dany2k Member

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    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 :)
     
  4. DaveA3

    DaveA3 Audi A-Trizzle!

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    Last edited: Dec 14, 2010
  5. s3dave

    s3dave TFSI Hybrid Supporter

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    I think you will still need your lambda as this is what changes the fuelling, downstream i think can be deleted if fitted
     
  6. finesse

    finesse Active Member

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    B1 S1 pre cat lambda around the manifold area

    ecp, TPS. and gfs sell them about £80....
     
  7. Welly

    Welly VX220 SC Driver :)

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    ^ 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.
     
  8. dany2k

    dany2k Member

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    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!
     
  9. finesse

    finesse Active Member

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    [​IMG]


    you can see the charge pipe and coolant tank?
     
  10. dany2k

    dany2k Member

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    wow finesse, that is a don corleone-level of reply! definitely worth a thankyou, thanks!
     

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