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ORIGINAL: rave_on

I bought the last '07 STS v8 from my local dealer earlier this month.  WHile sitting in the dealer parking lot adjusting the driver 1 position, the check engine light came on.  After checking the gas cap, my salesman took it to the garage.  after 3 hours they put me in a demo because "the battery had gone dead while on the showroom floor so they had to reprogram the modules".  WHen I picked it up a few days later, the check engine light came on as I pulled into my driveway.  Onstar diagnostic indicated o2 sensor signal, but said it was OK to drive if performance was not affected, which it was not.  But, an occassional stinky smell, more like an old sock than rotten eggs, comes thru the vents in the cockpit.  THe engine light went off after a couple of days, then came back on again.  THis time Onstar indicated a fuel mix issue, again said it was OK to drive.  Light went off overnite, but still an occassional smell.  THe next time the light came on I took it back to dealer and they put me in a rental.  Any thoughts or suggestions to help my local caddy dealer would be greatly appreciated! 

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ORIGINAL: rave_on

Rule #1; see Rule #1!!  Thanks guys; dealer says it's fixed, I'll quiz them up about codes when I pick it up this evening and report back with all the pertinent details.