Diagnostic Services at
Jefferson Auto Service
We offer professional, in-depth diagnostic services that go far beyond the basics, powered by factory scan tools and deep technical expertise. Whether you visit us in Harrison Township, Clinton Township, or Romeo, our ASE-Certified auto mechanics take the time to get it right—because when we do, your vehicle performs at its best.
Deep-Dive Diagnostics—No Guesswork, Just Answers
Modern vehicles are complex. Electrical systems, sensors, modules, and computer networks all have to communicate perfectly. When something goes wrong, you need more than a code—you need a shop that can test, verify, and explain.
At Jefferson Auto Service, we perform:
- Advanced diagnostic testing with OEM factory scan tools for all major domestic brands (Ford, GM, Chrysler, etc.)
- Road tests to replicate real-world conditions
- Oscilloscope testing for sensor signal accuracy and waveform analysis
- Module programming and reinitialization
- Network and communication system diagnostics
- Pinpoint testing to verify root causes—not just symptoms
We don’t throw parts at problems. We slow down, test thoroughly, and build a repair plan based on facts—not hunches.
Why Diagnostic Work Is Our Superpower
Diagnostics is one of the most time-consuming services we offer—but it’s also where we shine. Our team is trained, patient, and passionate about getting to the root cause of vehicle issues. And while it may take longer, our customers benefit every time—with more accurate repairs, fewer comebacks, and a vehicle that performs exactly the way it should. Take it from someone who’s been there:
"Cannot recommend them enough! They were able to schedule us for service within a day of calling. Within an hour or two, a technician had looked at it and we knew what needed to be fixed and how much it would cost. The repairs were significantly cheaper than what the dealership quoted us. I felt very confident with the auto mechanic taking care of us. Staff was courteous and friendly every encounter we had. Highly recommend it! We will be back!"
-Jessica S.
We’re proud to be the shop that other shops send their tough cases to. If another mechanic’s best guess wasn’t enough, we’re the ones who’ll take the time to figure it out. That’s our standard at all three Jefferson Auto Service locations—Harrison Township, Clinton Township, and Romeo (our newest shop, formerly Mr. Muffler, now fully integrated into the Jefferson family).
Schedule Diagnostic Testing in Harrison Township, Clinton Township, or Romeo
If your vehicle has a warning light, weird drivability issue, or recurring problem no one else can fix—Jefferson Auto Service is ready to help. We offer expert-level diagnostic services at all three locations: Harrison Township, Clinton Township, and Romeo, proudly serving nearby communities like St. Clair, Mt. Clemens, and Ray Township. Schedule your diagnostic appointment today and get real answers from a team that does it right.
