I failed smog(code PO 421) last week & have till 7-14-07 to fix it. What may be bad besides the sensors?

a question for you did you have to go to a test only station if so the state will help pay for your repairs you pay $100 and they will pay $500. this is the way in so. Calif. If you haven't gotten one the dmv may give you an extension to get repairs you need to go to dmv and ask for temporary operating permit if you need more time. Just make sure you pay the registration money before the due date. the price of the cat depends on your car my sisters jeep was $800 my vanagon is only $120.