Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Please note that it is not permitted to have referral links posted in your signature. Keep these links contained in the appropriate forum. Thank you.

https://www.boards.ie/discussion/2055940817/signature-rules

Audi A4 Fault query

Options
  • 14-04-2008 8:31pm
    #1
    bbability
    Closed Accounts Posts: 2,504 ✭✭✭


    Hi,

    Can someone tell me which oxygen sensor is that's faulty. I used Vag-com to find the fault and it has also been diagnosed with Bosch Esitronic software. Same fault found on both.

    1 Fault Found:
    16804 - Catalyst System: Bank 1: Efficiency Below Threshold
    P0420 - 007 - Short to Ground


    Is it the sensor on the manifold or the sensor on the other side of the cat??


Comments

  • Options
    #2
    Timmaay
    Registered Users Posts: 11,394 ✭✭✭✭Timmaay


    It's saying that the Catalyst is at fault, so that would suggest that its the o2 sensor downstream of the cat. Search these forums for that code, those boys know their stuff.


  • Options
    #3
    Mr.Diagnostic
    Registered Users Posts: 937 ✭✭✭Mr.Diagnostic


    P0420 is set when the cat has failed the cat ageing test. Basically the cat is not as efficient as it should be. A magic "mechanic in a tin" cure could help but it is likely that it needs to be replaced.
    P0420 does not point to either lambda sensor being faulty, quite the opposite.


Advertisement