Questions & Answers for: p0420

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Question about 2003 Corolla

2 Answers

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 ...

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Trouble shooting P0420 code, bank 1, OBD II for 2000'? Our 2000 civic (engine D16Y8) has P0420 OBD II code along with misfire on cyl 3 and 4. I changed out the plugs and the distributer cap. Can't get

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Question about 1999 Silverado 1500

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P0420 & P0430 codes 99 silverado i have a 99 silverado1500 4.8L and im getting codes P0420 and P0430? i was told it was my o2 that needed to be replaced, but theres 4 of um 2 (pre&post)on each

Question about 1996 Bravada

1 Answer

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 ...

Question about 1998 Golf

1 Answer

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 ...

Question about 2002 S60

1 Answer

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 ...

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 ...

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 ...

...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

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