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Check eng lt p0420, came on after 54.6 miles changed cat converter, should i change the 02 sensors

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So it came on after convertor was replaced? if so then yes probably need to replace it. what kind of vhicle? some aftermarket convertors do not work well

Posted on Oct 26, 2010

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04 Altima 2.5 s w 150k changed cat 2014 1 yr later p0420 code again what r normal reads for 02 sensors? reads @ idle fluctuate @ .3V b1 sensor & .8V b2 sensor.anyone had p0420 that wasnt a bad cat


Those cars are notorious for engine problems unfortunately. The exhaust valves tend to warp from heat after around 200k miles. Therefore throwing the O2 codes. Best outcome and cost effective thing I can recommend is replacing the engine with a new or low mileage engine.

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We have changed 2 o2 sensors on our mercury villager 2001 but when checking computer the codes p138 and p139 still come up


Check the electrical connectors which connect to the O2 sensors for corrosion and improperly high resistance.

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Error code P0430 rear catlytic converter where exactly is this located and what does it look like and estimated price?


just a word of advice there is no sensor that tells you if you need a cat ! that code comes on because of faulty o2 sensors have you changed the 02 sensors yet ? if not change them reset ( clear ) the codes that code will come on a few times just keep resetting or clearing it i have had 2 co workers not listen to me and changed the cat 400-600 dollars and the code just comes back on one guy had the cat changed two times and the code came back after i reset the codes 3 times it stayed off it seems like its preset to come on around 100,000 miles with 02 sensor codes DONT LET THE MECHANIC SELL YOU A CAT hope this helps

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Jeep 2008 Commander 5.7 code p0430 What does this code mean? Thanks,


code --catalyst system efficiency below threshold bank 2 -means that the o2 sensor [bank 2 and after cat converter] is detecting that the converter in not working efficiently as it should as per specs--check the 02 sensor --if good possible exhaust leak if good --possible cat converter gone bad and since it is an 08 cat should be covered under warranty check with a dealer most converters are covered for five years doesnt matter how many miles on vehicle

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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

2 Answers

Check engine light came on recently. Car then


The exhaust system has two 02 sensors One before the cat converter and one after. The #2 02 behind the cat converter is the one that trips the light if emmisions are unacceptable coming out of the converter. The #1 or front 02 sensor monitors and constantly adjusts the fuel to stay within parameters. If the #2 tries to compensate for an inefficient converter and it conflicts with the #1 02, the ebgine will run poorly due to either too rich or too lean fuel adjustment. Have the #2 02 sensor replaced and the converter checked. Good luck

Nov 15, 2009 | 2005 Toyota Corolla

3 Answers

Help with toyota corolla 2003 code P0420. Went to Autozone for check engine light help and they discovered BBCatalyst system efficiancy below threshhold-bank 1 Probable cause BB1. air leak in exhaust...


CODE PO420 CATALTYLIC CONVERTER SYSTEM FAULT.ITS SAYING FAULTY CATALTYLIC CONVERTER.IF IT BEEN A WHILE IF YOUR CAR HAS A WHOLE LOT OF MILES ON IT.YOUR SPARK PLUG CHANGE IS DUE AT 120000 MILES. DUE A LITTLE TUNE UP CHANGE AIR FILTER AND FUEL FILTER.SEE IF YOU HAVE ANY ENGINE FAULTS BAD PLUGS DIRTY INJECTORS ANY THING UP SET FUEL SYSTEM CAUSE CAR TO RUN RICH.EXCESSIVE UNBURN FUEL WILL GATHER IN CATALYTIC CONVERTER CAUSE IT TO BURN OUT.SHORTING LIFE OF THE CATALYTIC CONVERTER.

Aug 30, 2009 | 2003 Toyota Corolla

1 Answer

Catalytic converter in my 2000 honda civic gone bad??


The best way is to replace the cat, it could be the 02 sensor but would suggest you replace the cat from a aftermarket car parts store, they will coast about $80.00 tops and I would replace the 02 sensor as well after 8 years the 02 sensors get what is called lazy 02 syndrome and does not cycle fast enough to keep up with the changing fuel needs of the computer. If you replace the 02 sensor you will get better fuel mileage and will not risk plugging up the cat in the near future, And if you had any missing in the engine you have damaged the cat so replace it so you don't have to much back pressure, you can check the cat with a temp probe to see if it is functioning or not to be sure, but for a total of $100.00 bucks you will save yourself time and effort in the years to come, and itf the cat plugs up it won't run so change them both. hope this helps.

Jun 19, 2009 | 2000 Honda Civic

1 Answer

Check engine light comes on


sounds like a clogged converter

Mar 11, 2009 | 1987 Chevrolet Cavalier 4 Door

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