Shield came off underside of catalytic convertor and I still have the part. Would have to hose clamp part back together since mounting screws corroded and fell off. Would that work, or does the convertor need to be replaced? Also, how would I know if its the rear O2 sensor instead of convertor?
Acura CEL p0420 on 1998 Acura Integra
by rlandon in Folsom, CA on April 21, 2012
ANSWER by speedchiq , April 21, 2012
Leaded fuel was used where unleaded was called for An oxygen sensor is not reading (functioning) properly The engine coolant temperature sensor is not working properly Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe Retarded spark timing The oxygen sensors in front and behind the converter are reporting too similar of readings All possible causes of a P0420 code. Run diagnostics yet? Is 0420 the only TC showing? If there's another code in the system then that's a big piece to your puzzle. It should help narrow it down. If not .. I'd go have a professional look at it.