http://www.obd-codes.com/p0420

来源: 北美胡同串子 于 2014-09-23 07:37:05 [] [旧帖] [给我悄悄话] 阅读数 : (669 bytes)

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

Read more at: http://www.obd-codes.com/p0420
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