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Emissions Testing in West Valley City, UT
Salt Lake County emissions tests plus repair and retest in one shop, so West Valley City drivers can renew registration without the runaround. Walk-ins welcome.
4118 W 3500 S, West Valley City, UT 84120 · Get Directions
Mon-Fri 7:30am-6:00pm | Sat 7:30am-4:00pm | Sun Closed ·
- Waiting room
- Free Wi-Fi
- Open Saturdays
- Walk-ins welcome
- Online booking
12-month / 12,000-mile warranty* on parts & labor
Honored at every Master AutoTech location · Serving Utah and Idaho since 1963
*Exclusions apply. Ask your service advisor for full warranty terms.
- ASE Certified Technicians
- Best of State Utah
- Top Workplaces
- Family Owned Since 1963
Master AutoTech West Valley performs Salt Lake County emissions testing and emissions repairs so drivers across West Valley City, Kearns and Magna can renew their registration on time. If your vehicle doesn’t pass, we diagnose why, fix it and retest it in the same shop.
Salt Lake County drivers need an emissions test to renew registration, and our shop makes it easy: we’re on 3500 South between 4000 West and 4400 West. Most tests take under half an hour.
Emissions Services We Offer
Emissions test
Salt Lake County emissions test for registration renewal. Most tests take about 15–30 minutes.
Certified testing station
Emissions repair & retest
If you fail, we find the cause, from oxygen sensors to catalytic converters, repair it and retest.
Pre-test check
Worried about failing? We scan for codes and readiness monitors before you test.
Why Choose Master AutoTech West Valley for Emissions
Test and repair in one place
No bouncing between a test-only station and a repair shop.
We fix the cause
Codes tell us where to look; testing tells us what actually failed.
Open Saturdays
Test on Saturday, 7:30am to 4:00pm, without missing work.
Warranty on repairs
Emissions repairs are covered by our 12-month / 12,000-mile warranty*.
Our Certifications
Every West Valley technician is required to earn ASE certification within 90 days of joining our team.
Current Offers
Buy 3 Tires, Get the 4th Free
On new tires installed at Master AutoTech, October 1 – December 31, 2026. Ends December 31, 2026. See offer details.
More coupons & specials
Browse every current Master AutoTech coupon, plus our ProCare, Certified and Master service packages.
How Salt Lake County Emissions Testing Works
Salt Lake County requires an emissions test for most gasoline and diesel vehicles to renew registration. Your renewal notice tells you whether your vehicle needs one this year. Here’s what to expect:
- Bring your vehicle and registration renewal notice. The test is tied to your VIN and plate.
- We connect to your vehicle’s computer. On 1996 and newer vehicles, the test reads the on-board diagnostic (OBD-II) system and readiness monitors.
- Results are sent electronically. A pass is reported to the state so you can renew online.
- If it fails, we explain why. You’ll get the codes and our recommendation before any repair.
Common Reasons Vehicles Fail Emissions
These are the repairs we see most often after a failed test:
- Check engine light on
- Faulty oxygen sensors
- Failing catalytic converter
- Loose or damaged gas cap
- EVAP system leaks
- Engine misfires from plugs or coils
- Readiness monitors not set after a battery change
Tip: if you recently replaced the battery or cleared codes, drive normally for a few days before testing so the monitors can reset.
How Much Does Emissions Testing Cost in West Valley City?
Emissions test fees are set by the county, so the price depends on where your vehicle is registered. If your vehicle fails, repair cost depends on the cause: a gas cap or sensor is a small repair, while a catalytic converter is a bigger one. We always show you the codes and quote the repair before starting.
Need to spread out the cost? Master AutoTech offers several financing options, including the Goodyear Credit Card (6-month special financing on purchases of $250 or more), the Synchrony Car Care credit card, the 1stMILE Mastercard, Snap Finance, Acima, Surepay and RC Willey financing.
Emissions Repairs We Handle
- Oxygen and air-fuel ratio sensors
- Catalytic converters (see muffler & exhaust)
- EVAP purge and vent valves, hoses and gas caps
- Ignition coils, spark plugs and misfire repair
- EGR valves and passages
- Exhaust leaks ahead of the oxygen sensors
Environmental Responsibility
The Salt Lake Valley’s winter inversions trap pollution in the valley, and vehicle emissions are a big part of it. Keeping your vehicle in spec isn’t only a registration requirement; it helps keep Salt Lake County air cleaner and usually improves fuel economy too.
What West Valley City Drivers Say
“Both Brent and Jacob provide phenomenal customer service. They are so personable and just seem to be genuinely caring people. I took my car in for the advertised $80 A/C service and drove away with cool air. A couple weeks later, it stopped working and Brent offered to do the service again, not only at no cost but taking the car overnight for a more thorough service. They found a problem with the A/C hose and worked to replace it quickly, efficiently and for a fair, honest price. Upon picking up the car again, we actually ended up leaving our 2nd vehicle with them to be looked at for other issues because we felt so comfortable and trusting in this shop! We’re so appreciative of the good service so far and plan on calling these guys up whenever we need more work done.”
Kaesie S.
“I’ve brought in two vehicles in the last week. The first is my business van for which they tested the catalytic converters and found one to be completely blocked off. After replacement the engine breathes like it should and pulls stronger than I ever remember it being. My second vehicle is a 2002 Toyota Camry. Rather than replace the catalytic converter they were able to perform a repair to the flex portion of the catalytic converter assembly for only $147! Thank you Brent!”
Doug M.
“I love this place. It’s the only place I’ll take my car! The staff is so kind and knowledgeable, and I never feel like they are ripping me off or telling me that I need to fix things that don’t need to be fixed. They always take great care of my old car and give me the best tips for me to do what I can to keep it running too! They are always super fast and when it’s something that will take a long time to fix, they’re so good about calling me and keeping me updated on the progress! I love this Master muffler location!”
Jessie N.
About Master AutoTech West Valley
We’re a family-owned shop that treats every vehicle like it belongs to a neighbor. Master AutoTech started as Master Muffler in 1963 and grew into Utah’s largest auto repair franchise, and West Valley drivers have known this 3500 South shop by its Master Muffler mascot for years. Every technician here earns ASE certification within 90 days of joining the team. Meet our team.
You’ll find us on 3500 South between 4000 West and 4400 West, across from Holy Cross Hospital – Jordan Valley West, with I-215 a few minutes east. Look for the classic Master Muffler mascot sign on 3500 South and pull into our lot.
Wait in our waiting room with free Wi-Fi, or step out while we work: Harmons is a short walk east on 3500 South. We take care of drivers from West Valley City, Kearns, Taylorsville, Magna and Granger every day.
Download the Master AutoTech app and earn rewards
- Rewards & offersOffers and rewards land right in the app, not in a drawer full of coupons.
- Check-engine alertsSee the actual codes your car is throwing and message the shop about them.
- Maintenance trackingKnow what’s due and what’s overdue, with a weekly report on your vehicle.
- Glove BoxKeep registration, insurance and service records in one place.
How to get rewards: download the free app and your offers and rewards land right in it, ready to use at your next visit. Open the app before your visit to see what’s waiting for you. Book a Master Oil Change and get a free Master Link that connects your car to the app.
Areas We Serve
Drivers come to Master AutoTech West Valley for emissions testing from across West Valley City, Kearns and Magna.
- West Valley City
- Kearns
- Taylorsville
- Magna
- Granger
- Hunter
- South Salt Lake
Mon-Fri 7:30am-6:00pm | Sat 7:30am-4:00pm | Sun Closed
Get Directions · 4118 W 3500 S, West Valley City
✓ 12-month / 12,000-mile warranty* *Exclusions apply.
✓ Financing available · See options
✓ Free check engine light scan before you test
✓ Get rewards in the Master AutoTech app
Buy 3 Tires, Get the 4th Free
Buy 3 tires, get the 4th free, Oct 1 – Dec 31.
Ends December 31, 2026 · Details
Nearby Master AutoTech Locations
Master AutoTech South Salt Lake
5.5 miles away
3865 State St
Salt Lake City, UT 84115
Other Services at This Location
Frequently Asked Questions
Visit Master AutoTech West Valley
Master AutoTech West Valley
4118 W 3500 S
West Valley City, UT 84120
Get Directions
Mon-Fri 7:30am-6:00pm
Sat 7:30am-4:00pm
Sun Closed
Getting here
- From I-215: Take the 3500 South exit west; we’re on the left just past 4000 West, across from Holy Cross Hospital.
- From Magna: Head east on 3500 South; we’re on the right just past 4400 West.
- Parking: Pull into our lot on 3500 South, under the Master Muffler mascot.
