Mercedes-Benz engine diagnostics in Snellville, GA. Check engine light on? Limp mode? Running rough? We use Mercedes STAR-compatible diagnostic software to find the root cause — not just clear the code and send you on your way.
We go beyond pulling codes — we interpret them, verify them with live data, and trace them to their root cause before recommending any repair.
Mercedes-Benz uses proprietary control modules that generic OBD2 scanners can't fully access. Without STAR-compatible software, you're only seeing a fraction of what's actually wrong with your car.
A generic OBD2 scanner only reads powertrain fault codes from a single module. Mercedes-Benz vehicles have 50+ control modules — transmission, ABS, ESP, SRS, suspension, climate, and more — that a cheap scanner can't access. You'll miss most of what's actually wrong. STAR-compatible software reads every module completely.
Limp mode is a protective state the ECU enters when it detects a fault serious enough to risk engine or transmission damage. Power is severely reduced to allow you to get off the road safely. Common causes include boost leaks, transmission faults, sensor failures, and turbocharger issues. It should be diagnosed immediately — driving in limp mode long-term can cause additional damage.
Yes. A check engine light that doesn't affect drivability often indicates an emissions-related fault — oxygen sensor, catalytic converter, EGR valve, or evaporative system. These won't immediately strand you but will cause the car to fail emissions testing and can lead to more expensive repairs if left unaddressed. Have it diagnosed sooner rather than later.
Yes — a proper diagnostic takes time and specialized equipment. We charge a diagnostic fee that covers the full scan, live data analysis, and written report. If you proceed with the recommended repair at our shop, we apply the diagnostic fee toward the repair cost.
We diagnose the full Mercedes-Benz lineup including C-Class, E-Class, S-Class, GLC, GLE, GLS, CLA, CLS, AMG models, and older W124/W210/W211 classics. We also have AMG-specific experience on M156, M157, and M177 engines.
A full Mercedes diagnostic scan and written report typically takes 1–2 hours depending on the number of fault codes and the complexity of the issue. We'll call you with findings before you pick up the car.
Serving Snellville, Loganville, Grayson, Lawrenceville, and all of Gwinnett County.