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Code po420 - Blazer Chevrolet Cars & Trucks

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Could be your Catalytic convertor

Posted on Mar 12, 2011


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Posted on Jan 02, 2017

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Can catalytic converter cause a PO65O code


Pesky PO420 Codes - Eastern Catalytic

www.easterncatalytic.com/education/tech-tips/pesky-p0420-codes/
One of the most annoying is the persistent PO420 diagnostic code (Catalyst System ... not only shows its teeth when the catalytic converter is on the blink, but can also be ... Most, if not all, catalytic converter failures are caused by a problem or ...

P0420 Error Code: Catalyst System Efficiency Below ...

www.obd-codes.com/p0420
Repair information for the OBD-II trouble code P0420 - Catalyst System Efficiency ... If they have failed, it is likely due to something else that caused it to fail. ... the catalytic converter is broken or failed, it may be restricting the exhaust which will ...

explaining trouble codes po420 - po421 - Discount Catalytic ...


Jan 16, 2016 | Cars & Trucks

1 Answer

Check engine light is on


Go to google & type in ---OBD2 Codes
1998 honda accord PO420 etc

Mar 02, 2013 | Honda Accord Cars & Trucks

1 Answer

I have a 1997 chevy lumina. i had 2 coded before, po420 and po401. i changed the egr valve, and now the po420 is gone. i just replaced the egr tube, cleared the codes, and now the po401 is back. car sounds...


Well, the po401 is saying is that the egr valve has restricted flow. After changing the egr and the tube, something else is causing the restriction. a more thorough diagnosis is recommended. The po420 code sounds like a possible catalyst failure or an o2 sensor failure.

Oct 16, 2010 | 1997 Chevrolet Lumina

1 Answer

Code po420 on scan tool but o2 sensor was replace 2 months ago


Hello and welcome. the code P0420 is for a bad cat. converter. replacing 02 sensors wont repair this code. the code simply's means that thje cat. converter is not working as designed and will need to be replaced.

The PCM determines the oxygen storage capability of the catalytic converter has degraded below a calibrated threshold.

Jul 03, 2010 | 2004 Mazda RX-8

1 Answer

What is this code po420 bank 1 in a che?vy monte


I could go on and on about Po420 code but it's easyer to tell you to go to www.po420.com and everything you want to know and then some is there. Let me know if this was helpfull..4 thumbs up !

Feb 24, 2010 | 2002 Chevrolet Monte Carlo

1 Answer

I have a diagnostic trouble codes p1768,po300,and a po420. what does this mean?


I have tow of the three requested codes. po300 is misfire detected at multiple cylinders. See po301-306 represent the cylinder # misfire. So 301 is cylinder #1 misfire.

po420 is Catalytic Converter Efficiency Failure

Oct 08, 2009 | 1996 Plymouth Voyager

2 Answers

2000 corolla with trouble code po420


If the code has cleared on its own then you need to disconnect the battery and re-connect it. This will clear the codes out of the memory. If you don't want to do this you can go to an auto parts strore and have them hook the little computer up to your car and they can clear out the code as well.

Sep 02, 2009 | 2002 Toyota Camry

1 Answer

1997 toyota camry check engine light on,code po440,po420,po441,


P0420 is catalyst system efficiency below threshold (bank 1)

P0440 is evaporative emission control system malfunction

P0441 is evaporative emission control system incorrect purge flow

Mar 29, 2009 | 1997 Toyota Camry

1 Answer

PO420" Catalyst efficiency low Bank 1"


Replace the catalytic converter.

Mar 09, 2009 | 1999 Acura TL

1 Answer

CTS CODE PO420


most of the time its the sensor that cause this,id try replacing the sensor on it,that usually fixes that code,but you have to get the code cleared off with a scanner ,and then re-scan it to make sure it doesn't come up again,good luck with it.

Jun 29, 2008 | 2005 Cadillac CTS

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