Mercedes-Benz Smog Check
Mercedes gas + diesel + PHEV vehicles need California smog. EQS, EQE, EQB, EQS SUV, EQE SUV are BEVs and exempt. Diesel vehicles (Sprinter, GL/ML BlueTec) require intact DEF system.
Common reasons a Mercedes-Benz fails California smog
- Bluetec diesel DEF (AdBlue) system issues
- Older ML/GL/E-class catalytic converter degradation
- Sprinter vans with aftermarket exhaust mods
- AMG vehicles with non-CARB exhaust upgrades
How to prepare your Mercedes-Benz (pass first try)
- Diesel: confirm AdBlue/DEF tank is full
- Address any AdBlue system warnings
- Drive 50+ miles
- Verify aftermarket parts CARB compliance
Mercedes-Benz vehicle categories
- gas (C-class, E-class, S-class, GLA, GLC, GLE, GLS, AMG)
- diesel (Sprinter, GL/ML BlueTec)
- PHEV (GLE 450e, S-class 450e)
- BEV (EQS, EQE, EQB, etc. — exempt)
Common Mercedes-Benz smog questions
Where can I get a Mercedes-Benz smog check?
Any of our 13 BAR-licensed STAR-certified locations in San Diego, Orange, and Riverside counties handle Mercedes-Benz smog inspections. Walk-ins welcome. 15-25 minute inspections.
What are common reasons a Mercedes-Benz fails smog?
Bluetec diesel DEF (AdBlue) system issues is one of the most common. Visit our shop for diagnosis if your check engine light is on.
How can I prepare my Mercedes-Benz for smog inspection?
(1) Diesel: confirm AdBlue/DEF tank is full. (2) Address any AdBlue system warnings. (3) Drive 50+ miles.
Is my Mercedes-Benz EV/BEV exempt from California smog?
Yes — any 100%-electric Mercedes-Benz (no gasoline engine) is exempt under California Health & Safety Code §43002. PHEV versions are still required.
STAR-certified shops near you
All locations handle Mercedes-Benz smog inspections. Walk-ins welcome.