What the check engine light means
The check engine light is part of your vehicle’s on-board diagnostic system, known as OBD. The system watches almost every part that can affect emissions. When it finds a problem, it turns on the light. Depending on the vehicle, the light may read “Check Engine” or “Service Engine Soon”.
The system also stores information about the fault, so a technician can find and fix the problem. The cause can be anything from a loose gas cap to a faulty oxygen sensor.
Steady or flashing
A steady light
A steady light means the system has found a fault and the vehicle needs service soon. It does not mean you have to pull over.
A flashing light
A flashing light means a severe misfire. Slow down and have it checked as soon as you can. A misfire can damage the catalytic converter in a short time, and the converter is usually the most expensive emissions part to replace. Ford Canada adds that driving on with a flashing light may cause reduced power or the engine to stop.
Driving with the light on
Driving for a long time with a fault can damage other parts. Many faults also hurt fuel economy, performance or how the vehicle drives.
If the gas cap was loose, tighten it. The light should go off within a few days. If it stays on, have it checked.
Some warning lights mean stop. If the oil pressure light or the engine temperature light comes on while you’re driving, stop as soon as it is safe and switch the engine off. There is more on those lights on our tune-ups and engine repair page.
Newer vehicles and independent shops
In Canada, automakers make service information, diagnostic tools and training available to independent repair shops. This is done through a voluntary agreement called the Canadian Automotive Service Information Standard, or CASIS.
At Hub Motor Service
You’ll find the latest technology in diagnostic equipment at our shop. Myron Warkentin, Michael Warkentin and Corey Polson are all fully licensed Red Seal Automotive Technicians, and Corey has expertise in engine diagnostics. You can meet everyone on our team page.
Our services page lists the rest of the work we do, including exhaust repairs and oil changes and maintenance.