Smog Check Referee: What It Does and When to Go
Wednesday, October 7, 2026 · Fact-checked against official sources
The Smog Check Referee is a state-run service for the cases ordinary smog stations can't handle: disputed results, repair cost waivers, hard-to-find parts, exemption errors, kit cars, engine changes and collector cars. It's run for the Bureau of Automotive Repair (BAR), and you book by phone at 1-800-622-7733. It does not do repairs, and it does not test motorcycles.
Most drivers never need it. If your car simply failed, the Referee will send you to a repair shop first.
Who runs the Smog Check Referee program?
The Smog Check Referee program is a partnership between the Bureau of Automotive Repair and the Foundation for California Community Colleges (FoundationCCC), which has managed it under contract with BAR since 2004. Referee stations operate on community college campuses, with equipment and training to test vehicles regular stations aren't authorized to test.
The program also trains automotive students as smog check technicians. BAR is separate from the DMV.
Calls to 1-800-622-7733 reach the Referee Call Center, which handles scheduling and most questions; you can ask for a referee to call you back (asktheref.org FAQ).
What does a smog check referee do?
A California smog check referee provides six main services that licensed stations can't: reviewing disputed smog results, inspecting vehicles cited for emissions or exhaust noise, locating hard-to-find emissions parts, issuing repair cost waivers, verifying smog exemptions, and inspecting unusual vehicles such as kit cars and engine swaps. Collector cars get an abbreviated inspection only the Referee can perform.
Smog check results review
If you think your car should have passed, the Referee can give a third-party evaluation, but only after the car has been diagnosed and repaired at a licensed station and you still believe the result is wrong. The first appointment is a phone call about the dispute. The failed test must be on record, which takes until the next business day.
Citations and noise violations
Police can send you to the Referee after a ticket for modified emissions controls (Vehicle Code 27156) or a loud or modified exhaust (27150 or 27151). For 27156, the car must pass a complete Referee inspection, including a check that the engine software isn't tampered with. For noise, the Referee can test and issue a certificate if the car passes. The noise certificate fee is $108.
The Referee can't clear the ticket; you finish that with the court, which may still fine you. Fix the problem before booking. An exhaust baffle insert must be welded or riveted in, and the Referee can't take decibel readings on vehicles over 5,999 lb GVWR.
Parts locator service
When an emissions part is genuinely unavailable, usually on an older car, the Parts Locator Service can find an alternative or issue a Limited Parts Exemption. You must be renewing, have failed a smog check, have tried the usual suppliers, and have fixed every other failure. An exemption expires in 90 days, and if the part exists at any price, you don't qualify.
Smog exemption verification
If your DMV renewal notice asks for a smog check on a vehicle you think is exempt, such as a 1975-or-older gas car, a 1997-or-older diesel or an electric vehicle, the Referee can verify the exemption and issue an Exempt Certificate. Hybrids are not exempt. See cars exempt from smog check in California.
Kit cars, engine changes and unusual vehicles
The Referee inspects kit cars and other specially constructed vehicles, engine changes, grey-market imports, alternative-fuel conversions and modified vehicles. A specially constructed vehicle must see the Referee before registration. Once a vehicle passes the full Referee inspection, the Referee applies a BAR label, and future smog checks can be done at a regular station.
Collector cars
A collector car from model year 1976 or newer still needs a smog check, but it can get an abbreviated inspection that only the Referee performs: a tailpipe test, a fuel cap test and a check for liquid fuel leaks, plus confirmation that the car qualifies and is insured as a collector car (BAR: Collector cars). Under SB 1392 (Chapter 245, Statutes of 2026), qualifying collector vehicles built before the 1981 model year become exempt starting January 1, 2028.
Gross polluters with no STAR station nearby
A car that failed as a gross polluter must be certified after repair at a STAR station or the Referee. The Referee FAQ lists this as a reason to book when there are no STAR stations in your area.
What doesn't the smog check referee do?
The California smog check referee does not perform repairs, does not diagnose problems, does not inspect motorcycles of any kind, and does not provide money for repairs. Repairs and diagnosis happen at a licensed test-and-repair or repair-only shop. Financial help comes from BAR's Consumer Assistance Program.
The Consumer Assistance Program (CAP, 866-272-9642) offers income-eligible owners up to $1,450 toward emissions repairs on 1996-and-newer vehicles.
How does a smog check repair cost waiver work?
A smog check repair cost waiver lets you renew your registration now and gives you extra time to finish emissions repairs, after you've already spent at least $650 on them and the car still fails. It's issued by the Referee, it's one-time only, and it applies only during a registration renewal, never a sale or first California registration.
The steps, from the Referee's waiver page:
- Fail a smog check at a licensed station, and keep the paperwork.
- Spend at least $650 on emissions-related repairs at a licensed test-and-repair station. It doesn't have to be the station that tested you. Diagnosis counts, and so do CAP-funded repairs. Routine smog tests don't count.
- Retest. If the car still fails, you may qualify.
- Book a virtual appointment and submit your documents: both failed tests, repair receipts from the licensed station, and the diagnostic reports.
- Bring the car in. If the documents are approved, you're scheduled for an in-person inspection where the vehicle is assessed and, if it qualifies, the waiver is issued.
You can be disqualified if:
- The vehicle has had a repair cost waiver before. The limit is one per vehicle, per registered owner.
- Any emissions equipment is missing, modified or disconnected. Money spent fixing tampering doesn't count toward the $650.
- The vehicle is changing ownership or being registered in California for the first time.
- The vehicle failed the visible smoke test and the owner's income is above 225% of the federal poverty guidelines (BAR's Smog Check Reference Guide).
The waiver buys time, not a pass: the car must fully pass its next required smog check.
How do I book a smog check referee appointment?
To book a Smog Check Referee appointment, call 1-800-622-7733. The Call Center schedules you at the nearest Referee station. Have your license plate or VIN, the specific reason you need the Referee, and the Vehicle Inspection Report from your latest smog check ready. Appointments are scheduled for 50 minutes, and engine changes may take two slots.
Depending on why you're going, you may also need (asktheref.org: Scheduling):
- The Engine Family Number, if it's about a catalytic converter
- The Vehicle Code section, if you're clearing a citation
- The DMV sequence number, for a specially constructed vehicle
- Registration, renewal notice, Parts Exemption Letter, receipts, and any paperwork on how the vehicle was built
The Call Center gives you the exact list. Anyone can drive the car to the appointment as long as they bring the paperwork. Payment is by Visa or Mastercard only; cash and checks aren't accepted.
Get the car ready first
A referee can turn away a car that isn't safe or working: one that doesn't run, has bald or flat tires, a lit check engine light, lowered suspension, low oil, or fuel, coolant or heavy oil leaks. Not every Referee site can fit a large RV, so mention it when booking.
After the inspection
The referee reviews the results with you, and they appear on BAR's smog check history lookup from midnight the next day. If the car fails, you get a Vehicle Compliance Checklist to take to your technician.
How much does the smog check referee cost?
There is no single published statewide price for a Smog Check Referee visit as of October 2026. State law lets referees charge a fee that covers the cost of the service, and some services carry no charge. The one fee the Referee publishes is $108 for a noise inspection certificate. Ask what your visit will cost when you book.
A regular smog check averaged $69.16 in BAR's August 2026 report, and stations also charge the $8.25 certificate on a pass (smog check cost guide).
Why do so many cars fail at referee stations?
Cars fail at Referee stations far more often because the hard cases go there. In BAR's August 2026 Smog Check Executive Summary, Referee stations ran 291 initial tests on the OBD inspection system, and 68.73% failed. Statewide, the OIS initial failure rate was 7.60%.
Referees aren't stricter; every station works to the same BAR standards. The cars that reach them are engine swaps, kit cars, cited vehicles and disputed failures, which are more likely to have a problem.
When should you not go to the smog check referee?
You should not go to the Smog Check Referee after an ordinary smog failure that hasn't been diagnosed and repaired yet. The Referee won't fix the car, won't diagnose it, and requires repairs from a licensed shop before it will review a result.
Skip the Referee and do this instead:
- Failed for a check engine light, codes or readiness monitors? That's a repair job. Start with what to do after a failed smog check and our check engine light guide.
- Told to use a STAR station? Any STAR station can certify a directed vehicle; our STAR smog check guide explains why cars get directed.
- Short on money for repairs? Apply to CAP before work starts. The waiver comes later, only after $650 in repairs.
- Just want a cheaper or closer test? Find a regular station on our smog check near me page.
Go to the Referee for what it exists for: a result still disputed after repairs, a citation, a part that no longer exists, a wrongly flagged exempt car, or a vehicle no regular station may test.
Sources: Smog Check Referee: Services overview · Smog Check Referee: Repair cost waivers · Smog Check Referee: FAQ · Smog Check Referee: Program background · BAR: Smog Check · BAR: Collector cars · BAR Smog Check Executive Summary, August 2026
Figures checked against BAR, DMV and CARB sources as of October 2026.