Walnut Smog & Repair is a STAR Certified smog station and complete auto repair shop on E Walnut St. Smog checks, failed smog repair, check engine diagnostics, brakes and engine work, done honestly and priced fairly.


From STAR Certified smog checks and failed smog repair to brakes, suspension and engine work, Walnut Smog & Repair handles it on E Walnut St. Honest diagnosis, quality work, and a fair price you hear before we start.
Three steps. No pressure, no surprise add-ons.
Tell us your vehicle and what's going on. Open Monday through Friday, 7:30 to 5.
We show you what we find and quote it before any work starts. No scare tactics, no upsell games.
Repaired, tested and, when it's a smog job, retested right here so you leave with a pass.
Our smog bay, our lifts and real jobs: brakes, suspension, filters and serious engine work.










Walnut Smog & Repair is an independent STAR Certified smog check station and complete auto repair shop at 1323 E Walnut St in Pasadena. Customers know the owner, Arthur, by name, and many have brought their family's cars to "Art" for years.
Our reputation comes down to honest diagnosis. When the parts store says O2 sensor, Arthur checks anyway, and sometimes finds a disconnected hose in under a minute. When someone says you need a catalytic converter, we test first. Reviewers call him "very honest, friendly and knowledgeable."
Some customers have been coming to Arthur for almost 20 years. Most smog checks are quick, reviewers mention being in and out in 10 to 15 minutes, and there's a clean lounge with comfortable seating while you wait. We're open Monday through Friday, 7:30 AM to 5 PM.
We're on E Walnut St in Pasadena, just off the 210, easy to reach from Altadena, Arcadia, San Marino and the rest of the San Gabriel Valley. Call or send the form and we'll get right back to you.
Based on E Walnut St in Pasadena and serving the surrounding communities, Altadena, South Pasadena, San Marino, Sierra Madre, Arcadia, San Gabriel, Alhambra, La Cañada Flintridge, Eagle Rock, Temple City and Monrovia. Tap your area for details.
Not listed? If you're nearby, give us a call at (626) 449-6252, we serve drivers across the San Gabriel Valley.
If you've searched "smog check near me," "STAR smog station Pasadena" or "check engine light Pasadena," Walnut Smog & Repair on E Walnut St is built for exactly that. We're a STAR Certified smog check station that also handles failed smog repair and retests, check engine light diagnostics, exhaust and catalytic converters, electrical repair, oil changes, tune-ups, air and cabin filters, batteries, brakes, steering and suspension, engine repair, transmission service, A/C repair and pre-purchase inspections.
We test and repair everything from late-model SUVs to 1990s Toyotas and Nissans, and we diagnose before we replace parts. That's why drivers from Pasadena, Altadena, South Pasadena, San Marino, Arcadia, Sierra Madre and across the San Gabriel Valley trust us with their cars.
Come by 1323 E Walnut St #2, call (626) 449-6252, or fill out the form for a free, upfront estimate. Honest answers and fair prices, every time.
Yes. Walnut Smog & Repair is STAR Certified, so we can test vehicles whose DMV renewal notice says a STAR station is required, as well as regular renewals, sales and out-of-state registrations.
Monday through Friday, 7:30 AM to 5 PM. We're closed Saturday and Sunday. Call (626) 449-6252 and we'll tell you the best time to come in.
1323 E Walnut St #2, Pasadena, CA 91106, in the Harry's Glass Shop building just off the 210 Freeway.
Usually not long. Customers in our reviews mention being in and out in about 10 to 15 minutes, with a clean lounge to wait in. Call (626) 449-6252 for the best time to come in.
Yes. Bring the report. We diagnose the real cause, repair it, and retest the vehicle here. Often it's an oxygen sensor, a vacuum leak or a misfire, not a catalytic converter.
Yes. Older vehicles are a big part of what we do, including tailpipe testing on our dynamometer for vehicles that need it.
You get a clear, upfront quote before any work begins. If anything changes once we're into the job, we call you first.
When you need one, what gets tested, what's exempt, and how to walk out with a pass the first time.
Read moreYour renewal notice says 'STAR station required.' Here's what that means and what to expect at the test.
Read moreA failed smog check isn't the end of the world, and it usually isn't a catalytic converter. A step-by-step plan.
Read moreSmog checks, failed smog repair, check engine diagnostics and complete auto repair on E Walnut St. Honest answers and fair prices.