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PO420 CODE CAT EFEC - 2004 Isuzu Rodeo

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This can usually be set due to front O2 sensor malfunction
even though reading from front O2 sensor looks normall and not setting a code, its not reading correctly replace the front O2 sensor

Posted on Jun 26, 2009

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Saturn Astra P0420 Problem


Hi , A PO420 code on all cars and trucks is a bank 1 cat failure and this code is determined by the ECM (Engine Control Module) by 2 sensors the Up stream O/2 sensor (otherwise known by some car manufactures as a Air/fuel sensor) and the down stream O/2 sensor. If you remove the Cat you will still receive a code due to the down stream O/2 is looking for certain gases which is produce only by the Cat as exhaust gases is passing through it. So yes there is no way around it if your getting a PO420 it is best to first take your car into a reputable shop to find out what is causing the cat to fail in the first place ( most likely due to O/2 sensor failure ) and possibly other things that could of failed leading to O/2 sensor failures along with the Cat.

Hope this answers your question.
Pat

Dec 27, 2016 | Saturn Astra Cars & Trucks

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Engine light code po420?


Code 420 refers to the catalytic converter in the exhaust pipe.
The code means the engine computer things the cat is not working correctly based on the data coming from the O2 sensors.
The sensors and the cat would need to be inspected.

Nov 17, 2015 | Chrysler Pacifica Cars & Trucks

1 Answer

Does pouring alcohol in the gas tank turn off the trouble code for a 2000 Cadillac deville with the code of p0420.


. NO it will not . code po420 refers to cat converter system , bank 1--efficiency below threshold===causes cat converter---wiring--HO2S 2

Have the cat converter checked for failure and replace if necessary. Check the operation of the heated o2 sensor before that cat converter.

Jul 28, 2014 | Cars & Trucks

1 Answer

Trouble Code p0420 and p1399


code po420 refers to cat converter system bank1 - efficiency below threshold===causes -- cat converter---wiring---HO2S 2
code p1399 refers to cylinder no 6 misfire===causes --fuel/ ignition---VTEC system---MAP sensor--wiring---mechanical fault.

Dec 31, 2013 | 1999 Honda Civic

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

2 Answers

PO420 code-service engine light is on


P0420 Catalyst System Efficiency Below Threshold (Bank 1) first thing to do is go back to basics do a tune up (plugs) check the plug wires spray them with water or windex if you get a miss change them, run some fuel injector cleaner through it, don't just throw parts on it ,that is'nt cheap

Mar 24, 2010 | 2002 Nissan Altima

2 Answers

Check engine light on PO420 code ? recalls


Huge problems with these cars. The Pre-cat converter is built into the exhaust manifold. Expensive to replace. No Recall on this item. Some say that inferior compounds in the catalyst cause corrosion and early wear of the piston rings. I have seen one of these use 5 qts of oil in 300 miles. Is this car using excess oil?

Jan 16, 2010 | 2005 Nissan Altima

3 Answers

1998 saturn check engine lite comes on gives codepo420&po573


Code po573 is cruise control / brake switch circuit A circuit voltage high PO420 catalyst system below threshold, po573 is probably a bad brake circuit / switch problem, PO420 is a bad catalatic convertor for bank 1

Sep 28, 2009 | 1998 Saturn SC

2 Answers

Fault code po420 ; is problem sensors or is it the cat conv


The only thing that will set this code is the catalytic converter or the oxygen sensor behind it. Way to tell if it is the sensor is to monitor voltage reading with scan tool and see if it is fluctuating the same as the upstream oxygen sensor. If it is the converter is "free flowing" and will have to be replaced. If the sensor is "flatlined" then it is most likely bad and setting the code.

Apr 30, 2009 | Ford Fusion Cars & Trucks

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The code PO420 came on for my 2000 Toyota Camray ......


Catalyst Effeciancy below threshold (Bank 1) is the code meaning. Check or replace the oxygen sensors. Some cars have 2 .One is on the front of the cat. the other is the on the back. Check the back sensor . Other possible causes are leaking or damaged exhaust manifold, bad coolant temp sensor.If toyota did not replace both . replace the one on the back of the Caty.

Feb 02, 2009 | 2003 Toyota Corolla

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