2005 Buick LaCrosse "420 code engine check" Questions

...code read 420 what does that mean engine light came on code read 420 what does it mean I couldn't find engine code for 420 but may be body code take to AutoZone for free test and code meaning If it's ...

...code of 420 Code 420 is a catalytic converter is not working properly.Check the converter for leaks and the rear oxygen sensor for leaks.If they are good then you should replace the converter and ...

...code 420 My 03 Concorde had a 420 code, cat converter. The Auto Zone person said the converter could make my engine stop. I always thought it was just for emissions. I remember back in the day, you ...

...code 420/430 but the mechanic diagnostics do show show a bead catalytic convertor nor oxygen sensors. What else can it be? Getting Check engine code 420 and 430 catalytic convertor low efficiency. ...

...code is 420. What is code 420? if the code is p0420 it means catalyst system efficiency below threshold (cylinder bank no.1) how can i fix the the catalyst system efficiency below threshold cylinder ...

...420 what engine, what size. that is first question. misfire, map ,maf, iat, ect,tps and cat fail and low coolant temps. very odd mix there. did you pull connections, key on??????? it means they all ...

the cause of code 420 www.engine-light-help.com/generic-check-engine-light-codes.html

420 code catalyst system efficiency below threshold (bank 1). EGR replaced along with both upstream and downstream 02 sensors on bank 1. Check engine light keeps coming on. You could have an ...

420 code with a check engine light Code 420 means the O2 sensors are telling the computer the catalytic converter on bank one is not working correctly. Bank one is on the side with cylinder one. The ...

...420 sel Need to replace 02 sensor. Where is it located? Probably has 3 or 4 of them in the exhaust from the header down past the catalytic converter. Your check engine code should have stated which ...