Cadillac STS Forum - 2005 through 2012 Discussion, The Joys of my first CEL illumination in Past Cadillac Vehicle Discussion; '05 STS 62k-- just got my first check engine light! wahoo!
i think i should check gas cap first... any ...
Automobile(s): 2005 White Diamond STS N* 1SF RWD ACC/HUD
Re: The Joys of my first CEL illumination
I would drive it if nothing is obviously wrong...it might reset but it takes a number of drive cycles. If it doesn't go off in a week or so, take it in. I would see if you can get it read for free as suggested...nothing to lose! Welcome to the board!
We had a '98 of the previous generation STS and the gas filler/cap developed some corrosion. Well cleaned & lubed with a light film of petrolium jelly kept the CEL dark. If you change the gas cap, use OEM.
My gas cap broke...... the clicking sound you hear when tightening it stopped so I could not tighten it. So when a code came up AutoZone said yea gascap. Bought one for 1/2 the cost of the dealer. BUT Autozone could not reset the light said their had been a court case and they where ordered not to do that. Wonder who was behind that!!! Anyway he said oh it will recycle to off after a 1,000 miles or so. Since I knew it was the cap I waited until I had the miles and yes it cycled off.
Point being it does not cycle off, nor might other codes with just a few cycles. Like the post above I doubt the octane of the gas was the solution. Me thinks you have another issue. Go get the codes pulled.