My engine light came on, so I went in for service and all that was wrong is the gas cap. So the dealer replace the gas cap with a genuine Pontiac gas cap, but the engine light kept turning on, so I returned to the dealer and he tried a different cap, but the problem still persists. The dealer said not to let the tank get less that a quarter tank, but that doesn't work either. I have to get it reset, so I can get my certification for the DMV done.