wadi Posted September 7, 2008 Share Posted September 7, 2008 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 Link to comment Share on other sites More sharing options...
mintalkin Posted September 7, 2008 Share Posted September 7, 2008 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 Link to comment Share on other sites More sharing options...
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