Smog check resources
Featured guides
Diesel Smog Check in California: 2026 Rules
California diesels from 1998 and newer up to 14,000 lb GVWR need a smog check every other year and at sale, with no new-vehicle exception. The rules.
Does Jiffy Lube Do Smog Checks in California?
Only some California Jiffy Lube locations do smog checks: our directory lists 9 with a BAR smog license. Valvoline, Costco and other chains, checked.
Smog Check Referee: What It Does and When to Go
The California Smog Check Referee handles disputes, repair cost waivers, kit cars and engine changes. Book at 1-800-622-7733. What it does and when to go.
What Happens During a California Smog Check
A California smog check takes about 30 minutes: an estimate, vehicle ID, visual and functional checks, then an OBD scan or tailpipe test. Step by step.
Gross Polluter: What It Means and How to Fix It
A gross polluter failed the BAR-97 tailpipe test far over the limit: 2.53% of those tests in Aug 2026. Only STAR stations or the Referee can certify it.