'00 Seville STS Diagnostic Trouble Code P0420
P0420 is a catalyst system low efficiency
Question - I've had this code pop up every now and then; sometimes it clears itself and other times I clear it by clearing all codes. Can anyone shed some light on what triggers it? Is it a catalytic converter problem? At this point, I'm not too worried about it but I thought I'd ask you experts. |
P0420 occurs when pre and post cat.conv. O2 sensors data indicates cat conv performance is below what would pass emission test as analyzed by PCM.
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Thanks for the info Slowroll...since we don't have to pass an emissions test here, I'm not going to worry about it unless I see a degradation in the car's performance.
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