Thread: P0421 Code
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Old 08-26-2010, 01:20 PM   #1
snicknc
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Join Date: Aug 2010
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2002 VUE 3.0L
Default 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?

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