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Hopefully have a new O2 sensor on the way, thanks again Sun!! Also having a problem with my alarm on the denali going off when it's not suppose to, hoping all you alarm guru's can chime in and help me out!!
http://www.tahoeyukonforum.com/forum/showthread.php?p=476280#post476280
I had a similar alarm issue with my 99 Denali and it was completely random. It'd be sitting there for hours with alarm on and then at some random time it would give us two honks like the alarm was going off and then stop. No one was around it and it wasn't windy and the keys were on the counter so we know it wasn't the fob getting pressed in a pocket or something. Like it was just saying hello or something we never did figure out what the deal was with that.