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Check Engine Light Diagnostics in London, ON

Don’t replace parts based on a code. We diagnose the root cause of your check engine light with proper testing, then explain your options clearly.

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Accurate inspection
Clear estimates
Fast turnaround*

*Turnaround depends on parts availability and workload.

Diagnostics

Accurate Code Scanning + Pinpoint Testing

A code is a clue — not a diagnosis. We read codes, review live data, and test components so you don’t waste money on guesswork.

  • OBD-II scanning
    Read codes and freeze-frame data to see when the fault occurred.
  • Live data analysis
    Monitor sensors and fuel trims to spot what’s really happening.
  • Smoke / leak testing
    Find EVAP and intake leaks that trigger common engine lights.
  • Misfire diagnostics
    Test ignition, fuel, and compression factors causing rough running.
  • Clear plan & estimate
    We explain what failed, why, and what it costs to fix.
Good to know

Can I Keep Driving With the Check Engine Light On?

Sometimes yes, sometimes no. If the light is flashing or the vehicle is running rough, stop driving and call us.

SEO tip: Flashing check engine light usually means a severe misfire that can damage the catalytic converter.
Next steps

From Diagnosis to Repair — All in One Shop

Once we confirm the cause, we can handle the repair and verify the fix with a road test and final scan.

Common causes we diagnose

  • EVAP leaks (loose gas cap, purge valve, cracked hoses)
  • Ignition issues (spark plugs, coils, wiring)
  • Oxygen / air-fuel sensors and exhaust leaks
  • MAF/MAP sensor faults and intake leaks
  • Cooling system and thermostat-related codes
  • Catalytic converter efficiency codes (proper testing first)

Check Engine Light FAQ

Answers to the most common questions we hear in London, Ontario.

Will a code scan tell me exactly what to replace?

Not always. Codes point to a system, but testing is needed to confirm the failed part and avoid unnecessary replacements.

Why did my check engine light come on after getting gas?

A loose or faulty gas cap or an EVAP leak can trigger the light. We can test the EVAP system to confirm.

What does a flashing check engine light mean?

Typically a serious misfire. Continued driving can damage the catalytic converter. It’s best to stop and get it checked immediately.

Can you diagnose intermittent check engine lights?

Yes. Freeze-frame data and live data help, and we can inspect common causes that trigger intermittent faults.

Do you reset the light?

We can clear codes after diagnosis and repair, and we verify the issue is resolved so the light doesn’t just come back.