Home›Salt Lake City›Downtown SLC›Emissions Testing
Emissions Testing in Downtown SLC on Main Street
Salt Lake County emissions tests plus repair and retest in one shop, so Salt Lake City drivers can renew registration without the runaround. Walk-ins welcome.
690 Main St, Salt Lake City, UT 84101 · Get Directions
Mon-Fri 7:30am-6:00pm | Sat 8:00am-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 Downtown SLC performs Salt Lake County emissions testing and emissions repairs so drivers across downtown and central Salt Lake City 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 Main Street just north of 700 South, a block from the 600 South TRAX station. Most tests take under half an hour, so you can grab a coffee up the block while we test.
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 Downtown SLC 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, 8:00am to 4:00pm, without missing work.
Warranty on repairs
Emissions repairs are covered by our 12-month / 12,000-mile warranty*.
Our Certifications
Every Downtown SLC 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 Salt Lake 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 Wasatch Front’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 Our Main Street Customers Say
“First class service, first class mechanics. I brought my 2015 Jeep Grand Cherokee in with a potentially major issue. Not only did they diagnose the issue but they did it quickly and efficiently and in turn my bill was more than reasonable. I would highly recommend MasterTech Auto.”
Jeff Volimas
“What an excellent auto shop. Very clean, spacious waiting room. We were helped immediately by the very nice staff. It took them less than half an hour to diagnose and fix my car, despite not having an appointment. Will definitely be returning.”
Jenny Brown
“They were very busy but happened to be able to work me in. Completed the job in record time and the guy at the front desk, I believe his name was Kelly, was very, very pleasant. Let’s see how the muffler holds up. It was really a good price.”
Sharon Eastman
About Master AutoTech Downtown SLC
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 this downtown location served Salt Lake City as Master Muffler & Brake before the rebrand. Every technician here earns ASE certification within 90 days of joining the team. Meet our team.
You’ll find us on Main Street just north of 700 South, a block from the 600 South TRAX station, with West Temple one block west and State Street one block east. 600 South, one block north, connects downtown with I-15. Look for the big Master AutoTech sign and pull into our lot on Main Street.
Wait in our waiting room with free Wi-Fi, or step out while we work: Sol Agave and Millcreek Coffee Roasters are a short walk up Main Street, The State Room is a block east on State Street, and TRAX stops a block north at 600 South. We take care of drivers from downtown, Central City, the Granary District, Ballpark, Central Ninth and the Avenues 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 Downtown SLC for emissions testing from across downtown and central Salt Lake City.
- Downtown Salt Lake City
- Central City
- Ballpark
- Granary District
- Central Ninth
- Liberty Wells
- The Avenues
- Capitol Hill
- Marmalade
- South Salt Lake
- Millcreek
- Bountiful
Mon-Fri 7:30am-6:00pm | Sat 8:00am-4:00pm | Sun Closed
Get Directions · 690 Main St, Salt Lake 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
Part of Master AutoTech Salt Lake City, one of four Master AutoTech shops across the city. See all Salt Lake City shops
Master AutoTech Downtown State SLC
0.6 miles away
1050 S State St
Salt Lake City, UT 84111
Master AutoTech Millcreek
4.5 miles away
3385 Highland Dr
Salt Lake City, UT 84106
Master AutoTech Bountiful
7.3 miles away
1025 US-89
North Salt Lake, UT 84054
Other Services at This Location
Frequently Asked Questions
Visit Master AutoTech Downtown SLC
Master AutoTech Downtown SLC
690 Main St
Salt Lake City, UT 84101
Get Directions
Mon-Fri 7:30am-6:00pm
Sat 8:00am-4:00pm
Sun Closed
Getting here
- From I-15: Take 600 South east into downtown, turn right on Main Street, and we’re just north of 700 South.
- By TRAX: Ride to the 600 South station on Main Street; we’re about a block south.
- From State Street: Head west on 700 South one block to Main Street and turn right.
- Parking: Pull into our lot on Main Street, right under the Master AutoTech sign.
