If you have had a jump start, replaced your battery, or removed your battery to replace engine parts like I did yesterday, your newer model vehicles with computers will have lost some memory that the smopg test requires as so important, you fail the smog test
What the hell is so essential about the computer memory of my Grand Am? How much time I've spent over the speed limit? How much I've spun the tires to the extent the computer kicks in the idiot light for "Loss of traction" ?
The smog test guy tells me that it's the history of the computer tuning the fuel and exhaust parts that can vary to keep the emissions clean.
I told him that if the emission out the muffler is clean it is good enough for me. I have to come back once I've added a lot of miles to the history of the computer, so the state of California can see that my car doesn't have to work too much to keep the emissions in check