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focus engine managment trouble

2 posts in this topic

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!!!!!!!!!!!!!!!!!!!!!!

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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

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