Needed a smog check on my car (which was being stubborn). When my car was rejected, they charged only $12. Technician gave me some great advise about how often the cars computer was testing itself. After tracing down the issue, and driving around an appropriate amount of time for the car to test itself, I went back, and it passed!!! :) Full smog test (passing) was only $18, which is better than other places I went to have the car tested previously.