A leak in the exhaust system is most likely cause.
Raise car and inspect exhaust system for any leaks, also inspect EGR tube as you could have a leak in engine compartment getting into fresh air intake.
Have this checked ASAP, as exhaust gases contain carbon monoxide.
Also inspect body metal near exhaust system for holes or sealing material that is missing.
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Thursday, February 18th, 2010 AT 7:29 AM