1999 Mitsubishi Montero Sport "p0420" Questions

have a 20088 fully loaded nissan quest with code p0420 plugs and coils have been replaced already drives fine https://www.fixdapp.com/blog/p0420 https://www.fixdapp.com/blog/p0420 https://mechanicbase

P0420 2003 Toyota Corolla, HELP! FYI more background on a P0420 - http://p0420.com p0420 is a code for catalytic converter efficiency, the cat will need to be replaced. in some instances a software ...

...came on my 2011 Subaru Legacy premium. I connected the computer and got three codes. P020 PRM, P0420 PND, and P0420 CNF. Can you please let me know what they are? P0420 Catalyst System

what is p0420 on a 2006 chevy cobalt 2.2l P0420 is a code for the catalytic converter. It has failed the efficiency test. See this post for the full story on P0420 trouble codes ...

TROUBLE CODE P0420 CHECK ENGINE CAME AND I HAD IT CHECKED AT AUTO ZONE THE CODE INDICATED WAS P0420. VEHICLE ISN'T MISFIRING OR RUNNING BAD. P0420 isnt a misfiring code; this code P0420 is refer ...

Error codes: P0420 AND P0446 1996 Oldsmobile Bravada 4.3 liter. Error code: P0420 and will not pass emissions. Also code: P0446, I realize that the P0420 may be a 02 sensor, but I am looking for ...

P0420. States O2 sensor. Bank 1. Faulty spark plugs. Or hvac leak. Or catalytic converter. Where do I start to fix this problem. Just purchased original O2 sensor. Will start there then spark plugs. ?

my 2005 chevy equinox keeps showing problem code P0420 How do I fix this problem? 0 2 sensor near the catalytic converter or replace the catalytic converter The downstream O2 sensor reading should be ...

what means catalyst Efficiency below normal Got it scanned and it's P0420: Catalyst efficiency below thresholdbank 1. They said it could be a bad catalytic converter or oxygen sensor. I borrowed a ...

2001 golf gti had fault code p0420 come up had new rear lamda done still p0420 so got new front lamda, code still come up so then got a new cat, then fault code p0420 and p0120 come up,, then had new ...