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Hi, my buick century needs a smog, but my battery is dead,dead, won't turn over, my trunk won't open its so dead. Anyways it would require a new battery mostly, but does my car require a certain amount of times to be driven before it can 'reset' itself to smog correctly? I heard some of the 'newer' cars require this. Please advise Patty.

Answers from the Automotive Experts

Jessica Howe, Automotive Expert & Coach at


Thank you for writing in. You will likely not have to reset the warning lights. When you leave the battery unplugged, the car's computer will delete all of the saved diagnostic codes that set off your warning lights. Since the battery has died, and has been dead for a while, the codes may have already been deleted. The first thing you will want to do is jump start or replace the battery. You can also have it tested at an automotive parts store to see if it really needs to be replaced. If the warning lights and codes are still present when the vehicle does turn on, then you can have them erased by a technician or at an automotive parts store. As far as your smog test is concerned, you will want to make sure you get the vehicle up to operating temperature before the test. This will require you to drive it for 15-20 minutes before hand. 

Good luck!

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