Question about Pontiac Firebird

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The car excelerates then feels like it short off and shuts down code reader gave me this code p305 p420

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P0305 is a misfire on cyl. # 5
P0420 is catalyst efficency below threshold

Posted on Jul 11, 2009

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2 Answers

Check Engine Light. I have p420 P440 and P446 codes


You need a Catalytic converter and possibly a Evap. cannister

Oct 04, 2014 | 2003 Toyota Corolla

1 Answer

2001 mercury grand marquis reading code p305 misfire, spark plugs and coils changed


If you changed the #5 Coil then the code was wrong

You get lots of wrong codes on a ford, as a bad coil
spikes the pcm when grounding out to fire the coils
secondary side

Try putting the old coil back & walking the new one to
another cylinder,may take many days & many miles of
driving to get it fix,but better than a shop guessing, because
they hate fords

Jan 24, 2013 | 2001 Mercury Grand Marquis

1 Answer

1996 taurus p420 code


The P0420 means Catalyst System Efficiency Below Threshold (Bank 1), and the P0430 means Catalyst System Efficiency Below Threshold (Bank 2).
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ECU unlock immobilizer tool

Sep 17, 2012 | 1996 Ford Taurus

1 Answer

Shuts down after a short drive


sounds like plugged catalytic converter for the exhaust

Aug 08, 2009 | 1995 Jeep Grand Cherokee

1 Answer

Just tried to get a smog check and problem code p420 came up. Any idea what it could be?


The P420 code is a catalytic converter efficiency code. I would very much suspect that the catalytic converter is bad. They have been failing lately at the flange for the flex pipe.

Jul 14, 2009 | 2001 Volvo S40

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