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If your dashboard suddenly lights up with that small orange engine icon, don’t panic — but don’t ignore it either. The Check Engine Light London Ontario is one of the most important warning signals in your vehicle. It’s your car’s way of saying something needs attention before it becomes a bigger problem.

At Empire Service Center, we’ve helped hundreds of local drivers find out exactly why their check engine light came on. Here are the top five reasons and what you should do if it happens to you.

1. Loose or Faulty Gas Cap

It sounds simple, but a loose gas cap is one of the most common reasons your check engine light turns on. When the cap isn’t sealed properly, fuel vapors can leak out, which triggers a sensor in the emissions system.

The fix is easy: make sure the cap is tightened securely. If the light stays on, visit Empire Service Center to get it checked — we’ll clear the code and make sure there’s no leak or sensor issue.

2. Oxygen Sensor Malfunction

Your car’s oxygen sensors monitor how much unburned oxygen is in the exhaust system. When a sensor fails, it can cause your engine to burn too much or too little fuel, reducing performance and fuel efficiency.

Ignoring this can damage the catalytic converter, which is a costly repair. Our Engine Repair experts can quickly diagnose sensor problems and replace faulty components before they cause serious harm.

3. Spark Plug or Ignition Coil Issues

If your engine feels rough or vibrates more than usual, the issue could be with your spark plugs or ignition coils. These parts create the spark that ignites fuel in the engine. When they misfire, your vehicle loses power and burns fuel inefficiently.

Over time, this can lead to long-term engine wear. Visit our Electrical Repair team for a quick diagnostic — we’ll test the ignition system and replace only what’s necessary.

4. Catalytic Converter Problems

The catalytic converter reduces harmful emissions by converting toxic gases into safer ones. When it becomes clogged or damaged, the check engine light will illuminate and your car may struggle to accelerate or fail emissions testing.

Common signs include reduced power, poor fuel economy, and a rotten egg smell from the exhaust. Our team at Empire Service Center can inspect and service your exhaust and Engine Repair system to restore performance.

5. Transmission or Sensor Malfunction

Sometimes the check engine light is linked to your car’s transmission rather than the engine itself. Modern vehicles have sensors that monitor shifting, fluid pressure, and temperature. If any of these go out of range, the light may turn on.

If you notice jerky gear changes or hesitation, visit our Transmission Repair experts immediately. Delaying transmission issues can lead to costly replacements that could have been prevented with early service.

What To Do When the Check Engine Light Comes On

• Check your gas cap first and tighten it securely.
• Don’t ignore performance changes like rough idling or hesitation.
• Visit Empire Service Center — our technicians use advanced scanners to find the exact cause quickly.

Why Visit Empire Service Center for Check Engine Light Issues

• Fast diagnostics – We use professional-grade scanners that read manufacturer codes accurately.
• Transparent pricing – You’ll know exactly what’s wrong before any repair begins.
• Complete solutions – From Engine Repair and Electrical Repair to Transmission Repair, we fix everything that could trigger the light.
• Local experience – Trusted by London Ontario drivers for honest and reliable service.

Empire Service Center • 2293 Dundas St, London, ON N5V 1B4 • Phone: +1 519‑659‑0888 • service@empireautogroup.ca