P0421 Code
Hi,
I just picked up an 02 Vue 3.0L that popped the SES light literally driving it home after I signed the title-- fun stuff
This code caused me to fail the emissions part of my safety check.
After a lot of googling and searching the forums here, I can't seem to find anyone else that just has this one code. It seems like it's usually paired up with 0431 or a specific O2 sensor code.
My plugs were replaced about 20k miles ago by the previous owner at a dealership.
With just this code popping up, is it probably that post-cat O2 sensor on the front, or the cat itself?
REWARD EXCELLENCE!
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