Question about 2001 Volvo S40

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

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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.

Posted on Jul 19, 2009

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Posted on Jan 02, 2017

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2006 Subaru Forester with a P420 code. Can this be fixed by replacing a universal converter?


Unfortunately, universal catalytic converters do not have enough oxygen storage available and the code will return quickly if you use them. Asian imports are very touchy about this, Subaru's and Toyota's hate aftermarket universal cats!

Mar 03, 2015 | 2006 Subaru Forester

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What else will pull a p420 on this car - see below.


Drive at least 100 miles on a new catalytic converter. Also, some aftermarket converter I have tried did not work and I ended up using a real GM converter.

Jan 15, 2015 | 2007 Pontiac G6 GT Convertible

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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

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MIL/Check Engine Light will not come on during start up to pass smog 2000 Ford Mustang


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P420 code


P0420 means the cat converters tests below minimum efficiency. That can be caused by an exhaust leak. Take it to a small independently owned (NOT A CHAIN PLACE) shop to get a quote.

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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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My 1991 Toyota previa doesn't pass the smog check


There are many reasons why the engine and the emission systems fails a smog check. If you go to this page it will give you ideas on how to pass the test next time around.

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1999 Chevy Metro 1.0 L OBDII CODE P420. NEW O2


The o2 is just reporting information,it did not mean that it was bad,there is either restriction,in the cat,or there is a contamination in the fuel,an additive might clear it up,maybe.

Jan 19, 2010 | 1999 Chevrolet Metro

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I have an engine light on to my Toyota Corolla 2003; diagnosed by the autozone OBD11 SCANNER P420. I replaced the oxygen sensor and the light deleted. After driving the car for 30 miles the light came on...


Hi

The trouble areas associated with this code are as follows:
1)Gas leakage on exhaust system
2)Oxygen sensor
3)Heated oxygen sensor
4)Three–way catalytic converter

The idea is to check for exhaust leaks first then the front sensor and rear sensor. If these all check out then the cat needs to be replaced.

Hope this helps. Thanks for using fixYa

Nov 05, 2009 | 2003 Toyota Corolla

1 Answer

1998 CIVIC P420 CODE


the cat is bilt into manafold and the sencer is just up abuve it

Jun 19, 2008 | 1998 Honda Civic

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