Why cars fail, whether the retest is free, how many times you can retest, the Consumer Assistance Program, and when a Smog Check Referee gets involved — answered from state Bureau of Automotive Repair program rules.
The most common causes of a California smog fail, and what each one means for your retest.
An illuminated check engine light is an automatic fail in California. It must be resolved before your retest — the cause can be as minor as a gas cap or as major as a sensor. Do not clear the code right before testing.
The loose-gas-cap branch: a loose cap triggers an EVAP code. The fix is easy — tighten or replace — but drive 100–150 miles after the fix so the monitors reset before you retest.
Facts from the Cal Smog Network canonical answer library · per BAR Consumer Assistance Program guidelines
Locked coupon rates at our featured STAR stations — claimed online, honored right at the counter.
+ $8.25 state certificate fee (only if your vehicle passes) · most cars · +$10 SUV, truck & van
Honored right at the counter. One per customer. Not combinable with other offers.
Claim & Book →+ $8.25 state certificate fee (only if your vehicle passes) · most cars · +$10 SUV, truck & van
Honored right at the counter. One per customer. Not combinable with other offers.
Claim & Book →+ $8.25 state certificate fee (only if your vehicle passes) · most cars · +$10 SUV, truck & van
Honored right at the counter. One per customer. Not combinable with other offers.
Claim & Book →+ $8.25 state certificate fee (only if your vehicle passes) · most cars · +$10 SUV, truck & van
Honored right at the counter. One per customer. Not combinable with other offers.
Claim & Book →+ $8.25 state certificate fee (only if your vehicle passes) · most cars · +$10 SUV, truck & van
Honored right at the counter. One per customer. Not combinable with other offers.
Claim & Book →+ $8.25 state certificate fee (only if your vehicle passes) · most cars · +$10 SUV, truck & van
Honored right at the counter. One per customer. Not combinable with other offers.
Claim & Book →Check engine light most common.
Per BAR Consumer Assistance Program guidelines.
Yes automatic fail in California.
Per BAR Consumer Assistance Program guidelines.
Yes triggers evap code.
Per BAR Consumer Assistance Program guidelines.
Unlimited retests allowed.
Per BAR Consumer Assistance Program guidelines.
Depends on shop policy.
Per BAR Consumer Assistance Program guidelines.
CAP up to 1450 dollars repair aid for 1996 plus.
Per BAR Consumer Assistance Program guidelines.
Yes until registration expires.
Per BAR Consumer Assistance Program guidelines.
BAR-administered dispute resolution.
Per BAR Consumer Assistance Program guidelines.
Live Google ratings, pulled 2026-09-02. Tap to call — walk-ins welcome at every station.
Real stations, real reviews — the shops behind the deals on this page.
“Super quick! Found a coupon on their website, good price. I'll remember this place for next time for sure!”
— Penney B. · San Diego STAR Smog Check · Sep 1, 2026 · Google review
11,448 Google reviews across Cal Smog Network stations · photos from the stations’ own listings · counts & review pulled from each station’s Google Business listing, 2026-09-02