Engine Diagnostics FAQ – Expert Answers
1. What does the “Check Engine” light mean?
It means your car’s computer has detected a problem — anything from a loose gas cap to serious engine issues. We recommend scanning the vehicle as soon as possible.
2. Can I keep driving with the check engine light on?
If the light is solid, you may be safe to drive short distances. If it’s flashing, stop the engine immediately — this indicates a misfire that can damage the catalytic converter.
3. How do you diagnose engine problems?
We use professional OBD2 scanners, live data analysis, compression testing, and other tools to pinpoint issues precisely — not guesswork.
4. What is a diagnostic scan, and is it enough?
A diagnostic scan reads trouble codes, but that’s just the starting point. Our technicians interpret the data and perform targeted tests to confirm the real issue.
5. How long does an engine diagnostic take?
Basic scans can take 15–30 minutes. Complex diagnostics involving sensors, wiring, or mechanical checks may take 1–2 hours.
6. How much does an engine diagnostic cost?
Prices vary, but typical diagnostic charges range from $40 to $120 depending on the issue. We often waive the fee if you proceed with the repair.
7. Why is my engine running rough or shaking?
This could be caused by misfires, faulty spark plugs, dirty fuel injectors, or vacuum leaks. A proper diagnostic will reveal the exact cause.
8. Can a bad sensor cause engine problems?
Yes — faulty oxygen sensors, MAF sensors, or crankshaft position sensors can disrupt fuel delivery and timing, leading to poor performance.
9. What is a misfire, and how serious is it?
A misfire means one or more cylinders aren’t firing properly. It can damage the engine or catalytic converter if ignored. It’s a high-priority issue.
10. What does the code P0300 mean?
P0300 indicates random or multiple cylinder misfires. It usually points to ignition, fuel, or compression problems and needs further investigation.
11. Why does my engine hesitate or stall at stops?
Possible causes include dirty throttle bodies, faulty idle air control valves, or sensor issues. We check air, fuel, and spark systems to isolate the fault.
12. Can low oil cause engine warning lights?
Yes — low oil pressure can trigger engine lights or even limp mode. Always check your oil level, and let us inspect for leaks or consumption.
13. What happens if I ignore engine warning signs?
Delaying diagnostics can lead to expensive repairs, breakdowns, or long-term engine damage. Early detection saves money and prevents inconvenience.
14. Do I need diagnostics if there’s no light on?
Yes — performance issues can exist even without a warning light. Diagnostics help uncover hidden problems before they become major.
15. Do you offer mobile diagnostics or same-day service?
Yes, we offer same-day diagnostics by appointment. In some cases, we can come to you with portable scanning tools — just contact us to arrange it.