Mason Automotive

ASE Mechanic for Check Engine Lights

Engine Diagnostics | Mechanic for Check Engine Light

At Mason Automotive, we go beyond the auto computer diagnostics work, we find the real root cause. Modern engines are complex systems; we pair factory‑level equipment with expert technicians so you don’t waste money on guesswork.

What Our Engine Diagnostic Service Covers

Today’s vehicles rely on sophisticated engine management. Our team blends data from onboard computers with hands-on testing to pinpoint issues precisely.

  • OBD‑II & OEM scan tools: Read freeze‑frame data, live PIDs, mode 6, and manufacturer‑specific codes for accurate direction.
  • Electrical testing: Voltage drop, resistance and continuity checks on sensors, actuators, and grounds.
  • Oscilloscope analysis: Visualize cam/crank correlation, ignition waveforms, injector patterns, and network activity.
  • Fuel/air delivery checks: MAF/MAP evaluation, smoke testing for vacuum/EVAP leaks, fuel pressure & volume testing.
  • Mechanical condition: Compression, leak‑down, relative compression via amp‑clamp, timing inspections.

Why Choose Mason Automotive

Mason Automotive is a trusted name among engine auto repair shops in Bloomington, IN. Here’s why drivers choose us for auto diagnostics near me:

ASE‑Certified Technicians:
Deep experience diagnosing drivability, no‑starts, misfires, and intermittent faults.
Factory‑Level Tools:
Advanced scan software, scopes, smoke machines, and calibrated test equipment.
Clear Results:
You’ll get a plain‑English report with findings, root cause, and repair options.
No Guesswork:
We combine automated testing with technician diagnostics, saving you money on unneeded parts.
Transparent Pricing:
Fair estimates, approvals before work, and no hidden fees.
Diagnostic Appointments Available

Signs You Need an Engine Diagnostic

Pay attention to changes in how your vehicle drives. Schedule a computer diagnostic if you notice the check engine light solid or flashing, hard starts, stalling, rough idle, poor acceleration, or reduced power. Also observe bad fuel economy or fuel smell, rattling, pinging, or knocking under load, failed emissions, or strong exhaust odor.

How an Auto Diagnostic Test Works

Interview & Symptom Review: When does it happen? Hot/cold? Highway/city? While driving/idling?
Preliminary Scan & Health Check: Stored/active codes, freeze‑frame data, readiness monitors.
Data‑Driven Testing: Scope tests, smoke tests, fuel and ignition checks to isolate the fault.
Root‑Cause Verification: Confirm the failure with repeatable tests; no parts‑cannon.
Clear Report & Estimate: Findings, recommended repair, and any preventative notes.

Schedule Your Diagnostic Appointment

Check Engine Light FAQs

What does a flashing check engine light mean?

A flashing light usually points to an active misfire, which can overheat and damage the catalytic converter. Ease off, avoid hard acceleration, and have your vehicle tested as soon as you can. A steady light is less urgent, but it still deserves a test soon.

Isn't a code read at the parts store enough?

A code tells you which system flagged a fault, not which part failed. Our ASE-certified technicians read the codes, then test the sensors, wiring and components behind them. We identify the cause and recommend the work your vehicle actually needs.

What happens during check engine light testing?

We start by asking when the light came on and how your vehicle has been driving. Then we scan the stored codes and freeze-frame data, run targeted tests such as smoke, fuel pressure and ignition checks, and confirm the cause before recommending a repair. You get a plain-English report and an estimate before any work begins.

Where can I get my check engine light checked in Bloomington?

Bring your vehicle to Mason Automotive at 2111 S Yost Ave in Bloomington, IN. Book online or call, and a technician will test your vehicle and walk you through your options.

Services

Auto Service

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01

Factory Scheduled Maintenance

Taking care of your car regularly helps it last longer.

02

Complete Vehicle Inspections

We check your car from top to bottom to catch problems early. We look at all your car’s systems and tell you exactly what requires fixing.

03

Tire Replacement and Rotation

Replace worn-out tires for safety and rotate them to help them last longer.

04

Wheel Alignment

Misaligned wheels can lead to uneven tire wear and poor handling.

05

Fluid Services

Regular fluid checks and replacements keep your vehicle operating smoothly.

06

Fuel System Service

We clean injectors, check fuel lines, and optimize your system for peak operation.

07

Engine Diagnostics

Let our advanced diagnostic tools pinpoint the issue.

08

Battery Replacement

Avoid the inconvenience of a dead battery. We test and replace batteries to keep your car powered.

09

AC System Service

Stay cool and comfortable no matter the weather with Mason Automotive’s expert AC service and repair.

10

Brake Service

We check, fix, and replace brakes to keep you safe on the road.

11

Pre-Purchase Inspection

We inspect the car you’re thinking of buying before you make your decision, so you know exactly what you’re spending your money on.

Flexible Financing Now Available

Car repairs shouldn’t wait—and now, they don’t have to.

Ask us about this option or let our team know you’d like to explore it. We’ve got your back—without breaking the bank.

Schedule a Service

TESTIMONIALS

See What Our Customers Say

Check out the latest reviews from satisfied customers who trust Mason Automotive for their engine diagnostics needs.

Posted on Google Google
Tad Sperka
3 November 2025
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Mason Auto was incredible to work with, gave me all options before beginning any work, and kept me updated the whole way. They saved me a ton of money and hassle by correctly diagnosing a problem other shops got wrong.
Posted on Google Google
Tom M.
29 September 2025
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My wife has a 2012 Santa fe in which we were using a previous mechanic who was putting recalled parts on it... so to be clear this meant we were changing parts on the car wayyyy to frequently.... we were told by the previous people that were working on our cars to just 'get a newer car' bcuz our car was just too old for a Hyundai? We went to masons and found out that all that previous spoke on BS was lies! We had my wife's car fixed FINALLY and a true diagnosis on both our vehicles.... We got a good bit of eork done on my wife's car, and ive has some work done on mine as well, and we couldnt be happier with these guys at mason!
Posted on Google Google
Amanda Wisley
25 September 2025
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Quick turn around for my diagnostic. All the staff were awesome! Listened to what I had to say and gave great advice moving forward!
Posted on Google Google
Chris N
16 August 2025
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These guys raised the bar for mechanic services for me going forward. My only regret is that I didn’t find them sooner. They accommodated me for emergency repairs on my car just days before my move across the country. They saw me on short notice, thoroughly researched the issue, and provided me with the details of the entire diagnosis, troubleshooting, and repair plan every step of the way. The staff are friendly, knowledgeable, and work with integrity. Highly efficient, highly professional, highly transparent, highly recommend.
Posted on Google Google
Jim Spoolstra
3 March 2025
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Great place for quality work. Quick to diagnose problems and get the work done. From my experience it's obvious they know what they're doing. Nice clean shop too. I'll keep coming back.

Trusted Mechanic in Bloomington, IN

Your Trusted Mechanic Near You

Located in Bloomington, IN, Mason Automotive is your local hub for engine diagnostics and repair. If you’ve been searching “Mechanic for check engine light”, we’re here with fast answers and repairs you can trust.

Michael Phillips

Meet Michael, one of our experienced service technicians here at Mason Automotive! A military veteran with over 20 years of experience in the automotive repair industry, Michael brings a wealth of knowledge and hands-on expertise to our team. His extensive background in automotive diagnostics, maintenance, and repair makes him a valuable asset to the shop. With decades of experience under his belt, Michael understands the importance of quality workmanship and getting the job done right.

Outside of the shop, Michael enjoys keeping things simple. After spending his days working on vehicles, he prefers to leave the wrenches behind and spend his free time fishing, relaxing, and enjoying some well-earned downtime.

James Jacobs

Meet James, one of our skilled service technicians here at Mason Automotive! James brings a wide range of mechanical experience to the team, having worked on everything from everyday automobiles and side-by-sides to heavy equipment, excavators, buses, and just about everything in between. His diverse background has given him a well-rounded understanding of mechanical systems and the ability to tackle a variety of repairs with confidence. James takes pride in his work and is a valuable addition to the Mason Automotive team.

When he’s not turning wrenches, James enjoys spending time outdoors. He’s an avid fisherman who loves taking his boat out on the lake to see what he can catch. When he’s not on the water, you’ll likely find him enjoying bow hunting season or spending time at home with his family, his three dogs and his Russian tortoise.

Service Technician

Aaron Pfaff

Meet Aaron, one of our service technicians. Aaron joined our team in August of 2022 and has developed into a high-level technician! Starting from the basics and working his way up, Aaron has turned into our “workhorse” of the shop. Aaron does everything from alignments to brake repairs, complete engine replacements, and everything in between.

Don’t let his young age fool you, as this guy can do it all. Aaron is passionate about quad racing. His weekends consist of traveling the state and racing different local circuits. When he is not racing, he can usually be found riding his SXS around his property with his family and friends.

Owner

Jarred Mason

Meet Jarred, our owner/operator and the man in charge! Jarred is a “Master Certified” ASE technician, along with having factory training and certifications from General Motors. Jarred’s passion for helping people is what led him to start Mason Automotive.

Unlike conventional owners of auto repair shops, Jarred started his career as a technician and sees the auto repair industry in a different light. After years of seeing how people were simply treated as just another number in most shops, he wanted to create a place where people wanted to bring their cars because it was someone they trusted. Jarred works both in the shop and in the office, overseeing his vision of being “the local mechanic you can trust.”

Making sure people are taken care of, making sure vehicles are repaired properly, and ensuring people have a vehicle they can rely on are the heart of his business. Outside of his business, Jarred is passionate about his family and is a die-hard Atlanta Falcons fan. The whole family joins in every Sunday to cheer on their beloved Falcons.

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