STAR CertifiedTest Only Station
Fast, Accurate, Reliable. No appointment needed.
Cars, SUVs, trucks, diesels and small RVs, plus Clean Truck Check for semis. Pull in, get tested, get back on the road.
Mon–Fri 9 AM–5 PM · Sat 9 AM–2 PM · Sun closed
Emissions testing is the only thing we do, for almost anything you drive in California.
Test Only
State-certified smog inspection with results sent straight to the DMV. Walk in any time we’re open.
PriceCall for pricing
How it worksHeavy-duty
CARB-required emissions testing for semis and heavy-duty diesel trucks. Call ahead and we’ll have a tester ready when you roll in.
A Test Only station is licensed to test, not fix. We don’t sell parts or repairs, so there’s no upsell waiting on the other side of your results. You get an unbiased test and a straight answer.
The state holds STAR stations to tougher performance standards, and only STAR stations can certify directed vehicles, including ones flagged as gross polluters. If your DMV notice says “STAR station required,” you’re in the right place.
$10 off your smog check for 2000 and newer vehicles. Redeem it in store: show this coupon on your phone at the counter.
Screenshot it now so it’s ready when you pull in.
Open the coupon pageIn-store coupon · Smog check
$10 OFF
2000 & newer vehicles
Show this coupon at the counter. One per vehicle. Cannot be combined with other offers.
A1 Smog Check Test Only, LLC
491 Wildrose Ave, Unit N, Colton, CA 92324 · (909) 954-8003
The real shop, the real rollers, and a clean waiting room while your vehicle gets tested.
Comments from drivers we’ve tested. Each one is read by the shop before it shows up here, so spam stays out.
No comments posted yet
Tested with us? Tell other drivers how it went. Yours could be the first one up.
Look for the A1 window sign and the blue door under the big “N.” Vehicles go into the roll-up bay with the Official Smog Station banner.
Call (909) 954-8003Mon–Fri 9 AM–5 PM · Sat 9 AM–2 PM · Sun closed
| Monday | 9 AM – 5 PM |
|---|---|
| Tuesday | 9 AM – 5 PM |
| Wednesday | 9 AM – 5 PM |
| Thursday | 9 AM – 5 PM |
| Friday | 9 AM – 5 PM |
| Saturday | 9 AM – 2 PM |
| Sunday | Closed |
Straight answers about California smog checks. Still not sure? Call us.
(909) 954-8003All questionsMost cars, SUVs and pickups are done in about 20 to 30 minutes once they're in the bay. Diesels, RVs and Clean Truck Check tests can take a little longer. No appointment needed: just pull in.
If your renewal notice says "Smog Certification Required," yes. Most California vehicles need one every two years, when they change owners, and when they're registered here for the first time from out of state. Results go to the DMV electronically, so there's no paperwork to carry over.
Gas and hybrid vehicles from 1976 and newer, and diesel vehicles from 1998 and newer with a GVWR of 14,000 lbs or less. Vehicles eight model years old or newer usually skip the two-year check (you pay a smog abatement fee instead), but can still need one when sold. Electric vehicles, motorcycles and gas vehicles 1975 and older are exempt.
