Car questions · Something feels wrong
My check engine light is on. Is it safe to drive?
3 minute read · Checked October 2026 · Written at the Harkness counter, Coppervale, BC
The short answer
A steady check engine light usually means the car can get you to a shop if it drives normally, so book a look in the next few days and keep speeds gentle. A flashing light means the engine is misfiring hard enough to damage the catalytic converter. Ease off, pull over somewhere safe, and stop driving soon.
When is a check engine light safe to drive on?
The light means the engine computer has stored a fault. Most of those faults involve emissions, the fuel mixture, or a sensor reading out of range. Many of them leave the car driving the way it always does. If yours runs smoothly, pulls normally and shows no other warnings, a steady light is usually fine for gentle driving to a shop.
Gentle is the key word. Honda's owner's manuals say to avoid high speeds and have the car inspected right away. Ford's manuals warn that driving on with the light on can raise fuel use, make the engine run rougher, and lead to costlier repairs. A small fault left for months can grow into a bigger one.
Sometimes the cause is small. A fuel cap that did not close properly can turn the light on. Tighten it until it clicks. If that was the cause, the light usually goes out by itself after some normal driving.
What does a flashing check engine light mean?
A flashing light means the computer has caught a cylinder misfiring badly. Fuel that does not burn in the engine goes out into the exhaust. It can then burn inside the catalytic converter and overheat it. A converter is an expensive part, and a very hot exhaust is a fire risk.
Here is what the manuals tell you to do, in our words. Ease off the gas and leave the highway where it is safe. Park away from dry grass, which matters on a Kootenay shoulder in August. Shut the engine off and let it cool for at least ten minutes.
If it flashes again when you restart, keep it slow. Honda's manuals say 50 km/h or less, straight to the nearest shop. If the shop is a mountain pass away, a tow usually costs less than a new converter. Call us first and we will talk it through.
A long climb makes a misfire worse. Hauling a loaded car up Kootenay Pass keeps the engine under heavy load for many kilometres. If the light starts flashing on a climb, slow down and find a pullout instead of pushing for the summit.
Which warning lights mean stop right now?
The check engine light is amber on most cars. Red lights are more urgent. A red oil pressure light means park safely and shut the engine off right away. Honda warns that low oil pressure can cause serious damage almost immediately.
A red temperature light, or a gauge sitting at H, also means pull over. Our guide on what to do when the temperature gauge climbs covers the steps. And watch the steady amber light for company. If it comes on with the car shaking, stalling or losing power on a hill, treat it like a flashing light.
What happens when you bring it in?
We start by reading the stored codes. That part takes minutes. A code names the system that saw a problem. The work starts there. The skilled part is finding why. That might mean a smoke test for a vacuum leak, swapping an ignition coil to see if the misfire follows it, or watching sensor readings on a test drive.
The diagnostic hour is $89 flat, and we credit it to the repair if you have us fix it. Morning drop-offs get a call with photos and a number before 3 p.m. Nothing goes over the number you approve without a call. Start with the check engine light line on our symptom estimator, then book a bay for a diagnostic on a morning that suits you.
Asked at the counter
Will the check engine light reset itself?
Often, yes, once the fault clears. A loose fuel cap is a common example, and the light goes out after some normal driving. The code usually stays stored in the computer for a while, so we can still read what happened when you bring the car in.
Can I clear the code and keep driving?
You can. The fault that set it will still be there. Clearing the code also erases details we use to find the cause. If the light comes back, the problem is real. Bring the car in with the code still stored and the diagnosis goes faster.
How far can I drive with a steady light?
We cannot give you a safe number of kilometres, because it depends on the fault. A sensor fault might sit quietly for weeks. A small misfire can get worse on the next long climb and start flashing. Book a look within a few days and you will know which one you have.
Why pay for a diagnostic when a code read is quick?
The $89 hour covers the testing that finds the cause, and the code is only the first step. If you approve the repair with us, the $89 comes off the bill. Our guide on why a diagnostic costs money explains what that hour buys you.