My vehicle didn't pass smog, but these guys fixed most of the problems needed except for the catalytic converter which they do not do. When I had the catalytic converter replaced at another business, I returned to have my smog retested which passed with flying colors. Juan & his sons do a great job & the price is reasonable. Business is always busy, so if you have the patience or leave your car there if you don't. It's hard these days to find honest mechanics. I highly recommend this business to everyone! 5 Stars handsdown! TF