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  1. #1
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    Audi a3 O2 sensor & oil change HELP!

    Hi all, I own a a3 1.6 (poor engine, I know) 8v 52 plate with 76k on the clock! I have a engine management light on! I took it to the garage and the diagnostics said one fault only which was the O2 sensor ONE. He reset the computer than 2 days later the same thing! Which O2 sensor is that pre cat or past cat? I am also hoping to do a full oil change next week, as the previous owner didn't look after it and hasn't had it serviced in years. (I have also done air/pollen filters etc) I will be changing the filter, and cleaning and scrubbing the sump also. I have vw audi sealent for the sump as I am aware they prefer to use sealent and not the gasket itself? Is there anything Else I should be taking a look at/cleaning while the sump is off? Many thanks!

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  3. #2
    epox's Avatar
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    have a look in the stickies ..there is one for sump removal for the s3.
    Last edited by epox; 30th October 2013 at 21:16.

  4. #3
    phil miller's Avatar
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    Bank one sensor one is pre cat sensor, bank one sensor two is after cat sensor
    ​Wish Rachel would let me have my TDI mk5 back


  5. #4
    mattyboy199's Avatar
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    soak the sensor in vinegar for a few days, it cleaned my number 2 sensor up a treat & has been fully functional ever since
    2002 Dolphin grey S3 - Sym2+bose, heated leather, ally mirrors, R32 ARB's with superpro, Jabba stage 2 map, TFSI coils, Samco TIP, Forge DV & privacy glass

    2010 Green Kawasaki Ninja ZX6R - Akrapovic baffleless race can, LED cluster & HID's

    wanted for 8L S3:
    Unmarked grey rear bumper panel
    Milltek system

  6. #5
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    Thanks guys! I'd probley just replace it while I'm under the car! Don't know which pre cat sensor I need, there are Bosch ones on ebay but some are with cables that are 440mm and overs are 1200mm etc!

 

 

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