When your check engine light comes on, the car is telling you its computer has found a fault. It does not always mean a costly breakdown, but it should never be ignored. Here is what the light can mean and what to do next.
Steady light or flashing light?
A steady check engine light means the system has stored a fault and the car should be checked soon. A flashing light usually points to a more serious problem, such as an engine misfire, that can damage other parts if you keep driving. If the light is flashing, or the car is running rough, stop safely and call for advice rather than driving on.
Common reasons the light comes on
- A loose or worn fuel cap, which is worth checking first.
- Spark plugs or ignition coils that are worn or failing.
- An oxygen or other engine sensor that is out of range.
- Emissions system faults, including the catalytic converter.
- Air intake or fuel system problems.
Why a code reading is only the start
A code tells a technician where the car has noticed a problem, not exactly which part has failed. Proper diagnosis combines the code with live data and testing, so you replace what is actually faulty instead of guessing.
Get a check engine light diagnostic in Hamilton
Steel City Auto Care on Rymal Road East scans your vehicle, explains what we find in plain language and quotes the repair before any work begins. Learn more about our engine diagnostics in Hamilton, browse our core services, or contact us to book. You can also call 647-222-1009.
This guide is general information. Causes vary by vehicle, so follow your owner’s manual and have a technician inspect your car if a warning light stays on.