Car Diagnostic Test
Maryland Heights, MO
ASE-Certified Repairs Backed by a 24-Month Warranty. Award-Winning Service with Transparency and Trust.
Automotive Services
Car Diagnostic Test Services
At Quality Auto Repair & Auto Sales, we use advanced diagnostic equipment to quickly pinpoint issues in your vehicle. This approach saves you time and money by cutting out guesswork and finding the exact problem. If you’re having a problem with your vehicle and want it diagnosed and fixed, then schedule an appointment today.
AC Diagnostic
Our AC test checks every major component of your vehicle’s AC. If your air conditioning's blowing warm air or making odd noises, our AC diagnostic service can zero in on the issue fast.
Check Engine Light Check
The check engine light could mean anything from a loose gas cap to something serious under the hood. Don't just hope it goes away—let us hook up our scanner and tell you what’s wrong.
Electrical Diagnostic
Modern vehicles are packed with computers and sensors. When electrical problems pop up, our testing equipment helps us track down the culprit.
Exhaust System Diagnostic
Exhaust problems can mess with performance, fuel economy, and emissions. Our diagnostics cover the whole exhaust system.
Fuel System Diagnostic
Fuel delivery problems can cause rough running, stalling, slow acceleration, or lousy gas mileage. Our diagnostics cover everything from the tank to the injectors.
Suspension Diagnostic
Hear weird noises, feel vibrations, or notice handling issues? That could mean suspension trouble. Our diagnostics can spot worn or damaged parts.
Warning Signs
Signs Your Vehicle Needs a Diagnostic Test
Modern cars run on complex computers. When something's off, your car usually lets you know—sometimes in not-so-subtle ways.
Check Engine Light Warnings
The check engine light is your car's way of waving a flag. When that amber light pops on, it means the onboard system found a problem somewhere in your engine or emissions.
Seriously, don't brush it off, even if your car seems fine. Sometimes it's just a loose gas cap, but it could also be something that gets expensive if you ignore it.
If the check engine light flashes, that's a bigger deal—usually an engine misfire that could mess up your catalytic converter.
Bring your car in as soon as you see the light. We'll connect to your car's computer, read the error codes, and figure out what actually needs fixing.
Performance Issues and Unusual Noises
If your car starts driving or sounding different, pay attention. Watch for things like:
- Stalling or rough idling: Engine struggles to keep running or idles rough
- Decreased fuel efficiency: You find yourself filling up more often
- Hard starting: The engine doesn't want to start
- Strange noises: Knocking, hissing, grinding, or squealing
- Hesitation or jerking: The car hesitates or jerks when you accelerate
These might seem small, but they can be early signs of issues with your fuel system, ignition, or transmission.
Don't wait for a breakdown. Our diagnostic tools can find the root cause before things get worse.
Emissions Failures
If your car doesn't pass an emissions test, you'll want a diagnostic scan to see what's up. Common reasons include:
- Faulty oxygen sensors that mess with how your engine mixes air and fuel.
- Damaged catalytic converter that can't clean up exhaust gases. You might notice a sulfur smell or a drop in performance.
- Vacuum leaks that let in unmetered air, throwing off the air-fuel mix.
- EGR system issues that bump up nitrogen oxide emissions. A bad EGR valve can cause knocking, rough idle, or worse gas mileage.
Our diagnostics pinpoint which emissions part is failing, so we can fix it and help you pass your next test.
Car Diagnostic Test
How Car Diagnostic Tests Work
Modern diagnostic tests use computer tech to spot problems in your car's systems. We use special tools to read your car's computer and find issues that would take hours to chase down by hand.
Diagnostic Tools and Equipment
At Quality Auto Repair & Auto Sales, we use top-notch diagnostic equipment to check out your vehicle. The OBD-II scanner is our main tool, plugging into a port under your dash to talk to your car's computer.
We also use:
- Digital multimeters for electrical testing
- Fuel pressure testers to check fuel system health
- Compression testers for engine checks
- Scan tools with brand-specific software for deeper analysis
Some of our advanced gear can monitor real-time data and run specific tests on parts while your car's running. It's a huge help in zeroing in on weird, intermittent problems.
Reading and Interpreting Error Codes
When your check engine light comes on, your car stores a trouble code. We plug in our scanner and pull those codes up.
Codes follow a format like:
- P0xxx - Generic powertrain
- P1xxx - Manufacturer-specific
- Bxxxx - Body
- Cxxxx - Chassis
We don't just swap parts based on codes. We test further to make sure we fix the actual problem, not just the symptom.
Why Choose Us
Our Amenities and Benefits
Top Reasons to Trust Your Car with Us in Maryland Heights, MO
01
Complimentary Loaner Cars Available
02
Digital Inspections for Transparency
03
Wi-Fi & Comfortable Waiting Room
04
Award-Winning Auto Repair Services
05
24/7 Vehicle
Drop Off & Pick Up
06
Shuttle
Services
07
Towing
Services
08
Transparent
Pricing
09
ASE-Certified Technicians & Mechanics
10
Uber &
Lyft Rides
Come Visit Us
Our Maryland Heights Location
Address: 11457 Schenk Dr, Maryland Heights, MO 63043
Phone Number: (314) 313-3226
Hours: Mon - Fri 7:30 AM - 5:00 PM
We serve all of the following areas
- Maryland Heights
- St. Ann
- Creve Coeur
- Olivette
- Overland
- Earth City
- St. Charles
- Altheim
- Bellerive Estates
- Fernwood
- Benbush
- Vigus
- Champ
- Westbury Manor
- Bridgeton
- Breckenridge Hills
- Woodson Terrace
Zip Codes: 63017, 63043, 63146, 63074, 63132, 63141, 63146, 63132, 63114
