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Fault code help

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by tedster, Nov 29, 2009.

  1. tedster

    tedster New Member

    Oct 29, 2009
    Likes Received:
    Had a warning light come on the dash yesterday AA man came out fault is Po420 catalyst system efficiency below threshhold bank 1! car runs fine he couldnt find anything wrong with anything on a test run cleared the fault and the car has done a good 30 miles today fine with no more warning light coming on. Anyone had anything similar to this?

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