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Expert
46 Answers
- Posted on Jun 01, 2009
Re: codes p0420, p0446, po131
A code P0420 may mean that one or more of the following has happened:
- 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
A code P0131 may mean that one or more of the following has happened:
- Faulty o2 oxygen sensor
- Short to voltage on O2 signal circuit
- High resistance or open on O2 signal circuit
A code P0446 could mean one or more of the following has happened:
- Bad vacuum switch
- Broken or damaged EVAP line or canister
- Open in PCM purge command circuit
- Open or short in Voltage feed circuit to Purge Solenoid
- Faulty purge solenoid
- Restriction in EVAP solenoid, line or canister
- Corrosion or resistance in purge connector
- Bad PCM
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