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op

op 1/29/2013

2001 Honda Prelude Base 4 Cyl 2.2L

Engine

P0420 failed smog test

Something about air injection

1 Answer


Jimm

Jimm 1/29/2013

P0420 = Catalyst system efficiency below threshold (bank 1)

A code P0420 may mean that one or more of the following has happened:

Leaded fuel was used where unleaded was called for
A damaged or failed oxygen sensor (HO2S)
Downstream oxygen sensor (HO2S) wiring damaged or connected improperly
The engine coolant temperature sensor is not working properly
Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe
Retarded spark timing
The oxygen sensors in front and behind the converter are reporting too similar of readings
Leaking fuel injector or high fuel pressure
Cylinder misfire
Oil contamination

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