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focus engine managment trouble

wadi
wadi
in Ford Focus Club

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hi there new to the site, very good from what ive seen i have a ford focus 1.4 16v y reg 2001 and the engine managment light has come on i have read the trouble code on my mates scanner, p0420 cat bank 1 below threshold? will this need a new lambda sensor in the exhaust or a wiring fault? is this 2 sensors on this car 1 before cat and one after? what do you ford guys recon out there? any help much appriciated cheers!!!!!!!!!!!!!!!!!!!!!!

  • Quote


    it might just be the sensor before the cat thats playing up, with all the wet weather we have had first check that the seal is tight and not letting in any water witch would throw the code it could also be any of the following

    Damaged HO2S

    Malfunctioning ECT

    High fuel pressure

    Damaged exhaust manifold

    Damaged catalytic converter

    Oil contamination

    Cylinder misfiring

    Downstream HO2S wires improperly connected

    Damaged exhaust system pipe

    Damaged muffler/tailpipe assembly

    Retarded spark timing ng

  • Quote

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