Expert diagnostic services to identify and solve your car's problems. Advanced scanning equipment and ASE-certified technicians available.
Here for a check engine light? See our check engine light diagnostic page.
When a warning light comes on or your car suddenly won't start, you need more than a guess. SSS Auto Repair on Sheffield Avenue provides complete car diagnostics for Chicago drivers — using factory-grade scan tools and hands-on testing to pinpoint the real cause across your engine, electrical, drivetrain and safety systems.
A trouble code is only a starting point. Our ASE-certified technicians read the codes, then verify the actual fault with live data, component testing and a physical inspection before recommending any repair — so you fix the right thing the first time.
We diagnose vehicles for drivers across Lakeview, Lincoln Park and Wrigleyville, usually the same day, and you leave with a clear written report. Common issues our auto diagnostics track down include:
Don't ignore these critical warning signs
Dashboard check engine or service light is illuminated
Reduced power, poor acceleration, or rough idling
Getting fewer miles per gallon than usual
Unusual sounds like knocking, rattling, or whining
Any warning lights or messages on the dashboard
A noticeable drop in engine power, acceleration, or response
At SSS Auto Repair, we provide comprehensive diagnostic services to identify the root cause of your vehicle's problems. Our advanced diagnostic equipment can access all vehicle systems and provide accurate problem identification.
Accurate diagnosis is the foundation of effective repairs. Trust the experts at SSS Auto Repair to identify your vehicle's problems quickly and accurately.
A free code scan at a parts store can read the trouble code stored in your car's computer — but a code is not a diagnosis. The same check engine code can point to several different causes, and replacing parts based on the code alone often means paying twice.
A real auto diagnostic goes further: our technicians confirm the root cause with live data, targeted component tests and a physical inspection before any part is replaced. That's the difference between "the code says P0301" and knowing exactly which part has failed and why.
Want the full breakdown? Read free code scan vs. real diagnostic, or see our dedicated check engine light diagnostics in Chicago page. Ready for a straight answer? Book a diagnostic appointment today.
Comprehensive diagnostics at affordable prices
* Prices may vary based on vehicle make and model. Call for exact quote.
Systematic approach to problem identification
We discuss your symptoms, review service history, and perform a visual inspection of your vehicle.
Using advanced diagnostic equipment, we scan all vehicle systems and retrieve diagnostic trouble codes.
We analyze the diagnostic data, perform additional tests, and identify the root cause of the problem.
We provide a detailed written report explaining our findings and recommend the best repair options.
We stand behind our diagnostic work. If we identify the wrong problem or miss an issue, we'll re-diagnose your vehicle at no additional charge.
Common questions about car diagnostics and troubleshooting
The check engine light indicates that your vehicle's computer has detected a problem with the engine, transmission, or emissions system. It could be something as simple as a loose gas cap or as serious as a major engine problem. Our diagnostic scan will identify the exact cause.
Our basic diagnostic scan starts at $99 and includes a complete OBD-II system scan with code analysis. More comprehensive diagnostics start at $149 and include advanced testing of multiple vehicle systems. Prices may vary based on your vehicle and the complexity of the issue.
Most basic diagnostics take 30-60 minutes. More comprehensive diagnostics may take 1-2 hours depending on the complexity of the issue and how many systems need to be tested. We'll give you a time estimate when you arrive.
It depends on the severity of the problem. Some issues are minor and won't affect drivability, while others could cause serious damage if not addressed. We recommend getting it diagnosed as soon as possible to prevent further damage or safety issues.
OBD-II is the current standard used on vehicles from 1996 and newer. It provides more detailed diagnostic information than the older OBD-I system. Our equipment can work with both systems, but OBD-II provides much more comprehensive diagnostic capabilities.
Yes. A free code scan simply reads the trouble code stored in your car's computer. A real diagnostic uses that code as a starting point, then verifies the actual root cause with live data and component testing before any parts are replaced. Here's the full free-scan-vs-diagnostic breakdown.
In most cases, yes — we offer same-day diagnostic service at our Sheffield Avenue shop. For check-engine-specific issues, see our check engine light diagnostic page, or call (773) 472-4444 to confirm availability.
A no-start can be a dead battery, a failing alternator or starter, a fuel or ignition fault, or a security/electrical issue. We test the charging and starting system first to isolate the cause. Learn more about our battery, alternator and starter service, or call us and we'll advise whether it's safe to drive in.
We strongly recommend it. Replacing parts based on a code alone is guesswork and often costs more in the long run. A proper diagnostic confirms exactly which component has failed and why, so you only pay for the repair your car actually needs.
Schedule your car diagnostic service today and get accurate answers about your vehicle's health
Open Monday-Friday 8:30am-6:30pm, Saturday 9am-3pm
Serving Lincoln Park, Lakeview, Wrigleyville, and surrounding neighborhoods
2815 N Sheffield Ave, Chicago, IL 60657
