Check Engine Light
If your check engine light is on, your vehicle will fail the smog test. We can diagnose and repair the issue before testing.
⭐ 4.9 Rated · 155+ Reviews · STAR Certified Station
Smog Check in Concord, CA — From $49.75 with coupon.
Regular $59.75 · STAR Certified · + $8.25 state cert fee
STAR Certified station authorized for all smog test types — regular, directed, and gross polluter. Gasoline, diesel, and RV testing available. Most checks done in 20-30 minutes. Walk-ins welcome.
- STAR Certified Station
- Done in 20-30 min
- Walk-ins welcome
- Re-test free after repair
Smog Check Pricing
Transparent pricing, no surprises
| Vehicle Type | Smog Check | Certificate Fee | Total |
|---|---|---|---|
| 2000 & newer — Gasoline passenger vehicles | $59.75 | $8.25 | $68.00 |
| 2000 & newer — Diesel vehicles | $89.75 | $8.25 | $98.00 |
| 2000 & newer — RVs & large vehicles | $189.75 | $8.25 | $198.00 |
| 1996 – 1999 — Gasoline passenger vehicles | $99.75 | $8.25 | $108.00 |
Certificate fee of $8.25 is mandated by the state of California. Excludes big box trucks. Call for vehicles older than 1996.
New to California Smog Checks?
Learn how California's smog program works — exemptions, schedules, what gets tested, how to prepare, and what to do if you fail — at our complete knowledge guide.
Before Your Visit
What to know before your smog check
Battery Disconnect
If your battery was recently disconnected or replaced, the vehicle's readiness monitors may need time to reset. Call ahead so we can advise.
What to Bring
Bring your DMV renewal notice (if available), vehicle registration, and payment. No appointment needed — walk-ins welcome.
Why Choose Us
Concord's trusted STAR smog station since 1990
- STAR Certified — authorized for all DMV-directed tests
- Fast testing — most checks done in under 30 minutes
- Walk-ins welcome — no appointment necessary
- If you fail, we can diagnose and repair on-site
- Clear results — we will not upsell you on repairs you do not need
Failed Your Smog Check?
We handle the diagnose-and-retest in one shop
Bring us your Vehicle Inspection Report — we diagnose, repair, and re-test on-site.
Most STAR stations only test. We have an ASE Master Tech on staff, so if your vehicle fails we can fix the underlying issue (CEL, O2 sensor, EVAP leak, catalytic converter, etc.) and re-test free after the repair. Diagnosis from $195 — rolled into the repair if you proceed with us.
For a step-by-step walkthrough on what to do after a smog failure (reading your VIR, common causes, BAR's Consumer Assistance Program for up to $1,500 in repair help), see the California Smog Check Guide.
Before You Come In
Practical questions about your visit
No — walk-ins are welcome. Calling ahead at (925) 685-0101 is the easiest way to confirm current wait times and lane availability, especially during busy periods.
Most checks are done in 20–30 minutes from drive-up to certificate. If the smog lane is busy you may wait 10–15 minutes before your turn — call ahead and we can give you a current estimate.
Your DMV renewal notice (if you have one), vehicle registration, and payment. If you're using our website coupon, mention it at write-up. That's it — we handle the rest.
Yes. Diesel smog is $89.75 and RV / large vehicle smog is $189.75 (both + $8.25 state cert fee). Call us at (925) 685-0101 if you're unsure which category your vehicle falls under.
One coupon per vehicle. The $49.75 website coupon is already the lowest price we offer — it's not stackable with other promos. The $8.25 state certificate fee is mandated by California and applies to every smog check, everywhere.
Looking for general info — schedules, exemptions, how to prepare, what gets tested? See the California Smog Check Guide.
Smog Check by City
STAR Certified smog testing for the East Bay
Smog & Auto Repair Pleasant Hill
10 minutes from Pleasant Hill — straight down Monument or through Contra Costa Blvd.
Smog Check Clayton
Quick drive from Clayton via Clayton Road or Marsh Creek. Walk-ins welcome.
Smog & Auto Repair Walnut Creek
Easy access from Walnut Creek via I-680 — exit Monument Blvd.