2001 Audi A4 "p0420" Questions

p0420 wasnt catalytic converter or 02 sensors??? air flow meter.

...check engine light still remains on every time I bring it to auto zone and they give me a reading p0420 put a new censor light still on went back got another reading 0118 temp coolant censor

2003 A4 quattro 1.8T 71000 mi P0420 code. Audi says they will not warrant because, of course, I ruined the cat, not their control system. What are the exceptions to the fed emissions warranty? I had ...

...leak from the camshaft adjuster seals and turbo return hose. Autozone also pulled codes P0411 and P0420(which dealer never pulled). Do i hav a bad cat? What could be the underlying issue. Many ...

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 ...