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Catalytic Converter

mikkeyy st170
mikkeyy st170
in Maintenance / Servicing / MOT Discussions

Featured Replies

Hi I own a focus st170 2004 and was just wondering if any one could help me. I keep getting the fault code p0420. I have changed both lamdba sensors and had 2 catalytic converters. ( both aftermarket ) . So I rang ford and they said it requires a genuine catalyst. Could this be true does anyone know. Any help would be appreciated.

  • Quote


    No it doesn't require genuine catalysts but the cars fitted need to be of a good brand as the chances are cheap parts are probably inferior quality.

  • Quote
    • Author

    Thanks for the reply. The two cat's I have had have both been over 200 pound. What else could be causing the problem do you think?

  • Quote

    You say you have replaced the lambda sensors, what brand did you fit?

    It could be caused by a leak in the inlet or exhaust amongst other things.

  • Quote
    • Author

    The lamdba sensors are denso. OK that's helpful. I don't have a great knowledge of cars lol

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