Failed smog repair
Failed your smog check? We fix it and retest it.
As a test-and-repair shop, we find the reason your vehicle failed, repair it, and run the smog test again — without sending you to a second shop.
Common causes
Why cars fail smog
These are the problems we see most often on vehicles that don’t pass.
Check-engine light
Any stored fault that keeps the light on is an automatic fail. We read the code and trace the root cause.
Oxygen & other sensors
A lazy or failed sensor throws off the fuel mixture. See our sensor service.
Catalytic converter
A worn converter can no longer clean the exhaust. We confirm it’s the cause before replacing anything.
Evaporative (EVAP) leaks
Cracked hoses, a bad purge valve or a worn gas cap can let fuel vapor escape.
Ignition misfires
Worn plugs or coils raise emissions fast. See ignition service.
Incomplete readiness monitors
After a battery change or cleared codes, the car needs drive time before it can pass.
How it works
From fail to pass
Diagnose
We read the smog report and fault codes and test the suspect parts — no guesswork.
Repair
You approve a written quote first. We fix the cause, not just the symptom.
Retest
Once the repair is done and monitors are ready, we run the smog check again.
Related services
Repairs that often fix a failed smog
Smog repair FAQ
Smog repair questions
Can you repair a car that failed somewhere else?
Yes. Bring the failed smog report and we’ll diagnose and repair the vehicle, then retest it here.
Will clearing the check-engine light help it pass?
No. Clearing codes resets the readiness monitors, so the car can’t pass until it has been driven enough for them to complete.
Do you give a quote before repairing?
Yes. We explain what we found and give you a written quote; no work starts until you approve it.
How long do smog repairs take?
Many are done the same day. Larger repairs depend on parts availability, and we’ll tell you the timeline up front.
My car must be certified at a STAR station. Can you still help?
Yes. We can do the repairs; the final STAR certificate then has to come from a STAR-certified station.
Can I use California’s CAP repair assistance here?
CAP-funded repairs must be done at a STAR-certified test-and-repair station, and we aren’t STAR certified. See the Bureau of Automotive Repair’s CAP page for participating stations.
What should I bring?
The vehicle and the failed smog report (or the DMV notice) if you have it.
$20 OFF your smog check in Scotts Valley
Smog, repairs and tires — all at 107 Whispering Pines Dr #A.