2001 Chevrolet Impala "p0420 chevy" Questions

...chevy impala has a P0420 code and a check engine light that will not reset. Earlier P-codes indicated a problem with cylinders 1-3. these codes reset after a while. Found intake vacuum house off on ...

what does error code p0420 in chevy impala 2001 mean ? how we can fix it? I meant to post that as a solution.

...chevy malibu same o2 sensor issue p0420 or something like that ?! replace the converter and youll be fine i still have my old sensors in there that gave me the code :) there not saying there bad but ...

...chevy impala 2002. we need info on following codes: P0108, P0128, P 0341, P 0401, P 0420, P 1480, and P 1481. John p0108 map curcuit high input, p0128 coolant temperature below thermstat regulating ...

...Chevy Impala SS 3.8L Supercharged: I am getting OBD2 codes P0171 (System too Lean (Bank 1)) and P0420 (Catalyst System Efficiency Below Threshold (Bank 1)). I also found an oil leak today. I replaced ...

...Chevy Impala 3.4L V6 and I get DTC codes P0420 Cat Sys B1 Low Eff., P1626 Theft Deterrent Fuel enable signal lost, P1189 Eng oil Press Switch Circuit, u1000 Class 2 Data Link Malfunctio I have a 2002 ...

...P0420), is the same code for the catalytic converter, or a vacuum leak. Make sure if you do change the catalytic converter, ensure that the new one is OBD-2 compliant. And the vacuum leak could ...

...P0420. I had a new catyctic converter put on and took my car back for a second test and it was rejected. They told me that it was because my system has not reset itself. How long does it take for my ...

...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 ...

...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 fairly ...