Thread: P0421 Code
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Old 08-30-2010, 03:00 PM   #14
snicknc
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Join Date: Aug 2010
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2002 VUE 3.0L
Default Re: P0421 Code

I found this thread in the forum: 151713 (sorry can't post URL's yet, I guess)

which seems to point to 1) thermostat or 2) MAF. My temperature gauge is at 1/4 as opposed to the 3/8 - 1/2 range specified as "normal" in that thread.

As far as I know, neither has been replaced, but as I'll be pulling the intake anyway to do a compression check, I guess I'll go ahead and swap out the thermostat.

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