A check engine light is a symptom, not a diagnosis. Most shops read the code and replace the part the code suggests. That's not diagnosis — that's guessing with extra steps.
Troy performs true diagnostic work — reading all modules, analyzing live data, performing system tests, and verifying the root cause before any parts are recommended.
Common Symptoms
Our Process
- 01 Complete multi-module scan
- 02 Fault code analysis and prioritization
- 03 Live data stream review
- 04 Targeted system testing
- 05 Root-cause identification
- 06 Written diagnosis with repair recommendations
- 07 Pre-repair cost estimate
What's Included
Frequently Asked Questions
Is a diagnostic the same as a code read?
No. A code read takes 5 minutes and tells you what system is affected. A diagnostic tells you why — and that takes skill and time.
Do I pay for the diagnostic separately from the repair?
Yes. Diagnostics are charged separately. The diagnosis cost is credited toward the repair if you proceed with us.
Can you diagnose faults from other shops?
Yes. We regularly perform second-opinion diagnostics when another shop can't find the fault.
Available in Lake County
Is Your Vehicle Showing Fault Symptoms?
Connect with Troy directly. We run complete waveform diagnostics and print accurate test reports.