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P0421 CODE
CITROËN C4 CACTUS

  • @user_1049645 Jul 09, 2022
    Member
    This is for cactus c4 2018
    My EML came on and it showed that the car didn’t recognise the catalytic converter, citron said as first route of fix, to complete a software update. 6 weeks later the EML came back on and citreon then said it needed a new cat.   The car is only 4 years old and 27k miles…..cat is  not damaged in any way  soot levels and dbf all fine.  Turns out this is a known fault with these cars……that a technical services bulletin was issued……so don’t get tricked into paying for a new cat without checking this out.  Bit of a challenge, but end result it got covered under warranty!
    Reply

    Started

    09.07.22

    Latest reply

    22.07.22

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    1314

  • @Sciewher Jul 22, 2022
    Member
    Interesting. Thank you for this information, this is useful information, if possible, continue to share such information!
    Reply

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