My check engine light has been coming on and then going off.
It comes on after I fill the tank and goes off after it gets down past half empty.
Sounds like a loose or defective gas cap, right?
I had the cap checked and it is OK
I went over Monarch pass 12,000 feet and noticed that the light went off and stayed off until I came back over the pass back down to my normal altitude.
If it isn't the gas cap what is it???

I checked the codes and this is what came back;
P0422 & P0442.
Anyone have a Volvo code list?
Klaus?

A few links that might help:

http://www.elantraxd.com/forums/showthread.php?p=65529

http://volvospeed.com/vs_forum/lofiversion/index.php/t87196.html

http://forums.swedespeed.com/zerothread?cmd=print&id=59895

http://www.dnr.mo.gov/gatewayvip/docs/nov05-gar.pdf

There are a few other reasons. Stop at an autoparts store and get your codes read. There may be a residual code even with the CEL off.

Klaus
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The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)

Thanks Klaus
As always, good advice