Hey all,
I have been doing alot of searching on this topic and im not sure how to proceed. Here is the deal.
About six months back I had ignition problems that were hit and miss on my 2002 model, all stock. And the CEL code then was cylinder misfire. Over time I eventually changed the plugs and ignition coils and it fixed the problem.
But my check engine light is still on reading the P0421 code now "Cat below threshold during warmup".
Question is: Is the cat damaged from the misfire?
Should I change the O2 sensors?
I inspected all the harnesses on the O2 sensors for loosness, rechecked the plugs for fouling and also there is no exhaust leaks detected. I have reset the CEL a few times by dissconnecting the battery for a few min. 40miles later its on again with same code.
Im stumped and I dont want to take it to Mazda to rape my wallet. Car runs perfect and gets 30mpg... But im at 77k and the emissions warranty is through 80k i believe. Any ideas are greatly appreciated...
I have been doing alot of searching on this topic and im not sure how to proceed. Here is the deal.
About six months back I had ignition problems that were hit and miss on my 2002 model, all stock. And the CEL code then was cylinder misfire. Over time I eventually changed the plugs and ignition coils and it fixed the problem.
But my check engine light is still on reading the P0421 code now "Cat below threshold during warmup".
Question is: Is the cat damaged from the misfire?
Should I change the O2 sensors?
I inspected all the harnesses on the O2 sensors for loosness, rechecked the plugs for fouling and also there is no exhaust leaks detected. I have reset the CEL a few times by dissconnecting the battery for a few min. 40miles later its on again with same code.
Im stumped and I dont want to take it to Mazda to rape my wallet. Car runs perfect and gets 30mpg... But im at 77k and the emissions warranty is through 80k i believe. Any ideas are greatly appreciated...