Po420 issues
Hello everyone. I have a 2004 Chevy Blazer and have been having issues with a P0420 code. I checked the sensors and they were bad and replaced them; however, the code came back. any suggestions? the Cat looks good, there are no leaks that I am aware of...
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Did you ever experience:
misfires leaking injectors Has something been changed before the code was set such as: distributor spark wires spark plugs And how do you know that the CAT is good from looking at it? The diagnosis would involve looking at the signal from the front and aft O2 sensors directly. That is usually what the ECU does to determine if the CAT is good and if not will set the fault code P0420. Which sensors did you change? (I guess the O2 sensors ahead and aft of the CAT - but just to make sure we get the whole picture) |
Originally Posted by Simplechevy
(Post 730386)
Hello everyone. I have a 2004 Chevy Blazer and have been having issues with a P0420 code. I checked the sensors and they were bad and replaced them; however, the code came back. any suggestions? the Cat looks good, there are no leaks that I am aware of...
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