Service
Check-Engine / Diagnostics in Rockville, MD
We read the real fault codes your car is throwing — and explain them in plain English.
A generic code reader only sees a fraction of what your car knows. We use factory-grade diagnostic tools that talk to every module, so we find the actual cause instead of replacing parts and hoping.
What’s included
- Full-system scan of every control module
- Fault-code and live-data analysis
- Wiring, vacuum and smoke testing where needed
- Plain-English explanation and upfront quote
- Code clearing and verification drive after repair
Signs you need it
- Check-engine or warning lights
- Rough idle, hesitation or stalling
- Poor fuel economy
- Limp mode or reduced power
- Warning messages that come and go
Why it matters
Accurate diagnosis is the difference between a $150 fix and a $1,500 guess. You pay for the repair that is actually needed.
Frequently asked questions
Is the check-engine light an emergency?
A steady light means get it checked soon; a flashing light means pull over safely and stop driving — a misfire can damage the catalytic converter.
Can't I just use an inexpensive code reader?
It will give you a code, but not the cause. German cars store manufacturer-specific codes only factory-grade tools can read.
What does a diagnostic cost?
We quote the diagnostic fee up front, and apply it toward the repair when you go ahead with the work.
Your German Car Deserves a Specialist.
Call (301) 881-1310 to book — same-week appointments available.