Can I drive with a check engine light on?
It comes down to one thing: is the light staying on steady, or is it blinking? Those are two very different situations. One usually gives you a little time to get in. The other means pull over now.
Here’s how to tell them apart, and what to do in each case.
Steady light: get it looked at within a day or two
A steady check engine light means your car’s computer noticed that something isn’t running the way it should. It could be something small, like a loose gas cap or a worn sensor. It could also be something bigger just starting to develop, like an ignition or fuel problem.
The good news: a steady light is almost never an emergency in the moment. You can usually drive a short distance to get it checked.
The catch: driving on a steady light for days or weeks is how a small, affordable problem turns into a big, expensive one. A cheap part that gets ignored can take a pricier part down with it. So treat a steady light like a two-day reminder, not a someday reminder.
Steady light: drive gently, get it checked within 1 to 2 days.
Go easy on the gas and skip the highway if you can. If the car starts running differently, move it up your list. The sooner it’s looked at, the smaller the fix usually is
Flashing light: stop driving
A blinking check engine light is a whole different story. It usually means the engine is misfiring, and raw fuel is getting dumped into the exhaust where it doesn’t belong.
That overheats an expensive part called the catalytic converter, and the damage can start within minutes of driving. This is one of the pricier repairs on any car, and every mile you drive on a blinking light can make it worse.
So when it blinks: find a safe spot, pull over, and turn the engine off. Then call for a tow. Don’t try to nurse it to the shop.
If the blinking stops and the light goes back to steady, the misfire paused for a moment, but the problem is still there. Get it in before you drive it again.
Flashing light: pull over as soon as it’s safe.
A blinking light means real damage is happening while you drive. Don’t drive to the shop. Call for a tow. If it stops blinking and goes steady, the problem hasn’t gone away
What if other warning lights come on too
Some combinations mean stop right away, steady or flashing.
A check engine light along with a red temperature gauge or an oil pressure warning is a stop-now situation. Those can ruin an engine in minutes.
A check engine light with the battery light may point to a charging problem. The car might run for a little while on battery, but it will eventually die. Get somewhere safe before it does.
And any check engine light that comes with shaking, stalling, a burning smell, or smoke means stop and call for help.
The code is a zip code, not an address
When the light comes on, a lot of drivers swing by a parts store for a free code scan. That scan pulls a number the car stored, and that number points you toward the general area of the problem.
Think of it as a zip code. It tells you the neighborhood. It does not walk you to the front door.
Take a common code that points to “engine misfire.” It doesn’t say whether the cause is a worn spark plug, a bad coil, a fuel problem, or something deeper. Guessing from the code alone leads to swapping parts one at a time and hoping. That usually costs more than finding the real cause the first time.
The code is the zip code. Testing & Analysis gets you to the front door.
A scan reads the stored code and points to a system. Our Testing & Analysis takes that code, checks it against live readings and a test drive, and pinpoints the actual cause. Our ASE-certified technicians won’t recommend a repair based on a code number alone. The written estimate you get reflects what they confirmed, not what they guessed.
What the light says about the bigger picture
On a well-kept car with a good service history, a check engine light usually points to one specific thing. Get it checked, fix the cause, move on.
On an older car with a lot of miles that has also needed brake, suspension, or cooling work lately, it’s a different conversation. The question shifts from what set off the light to where the vehicle stands overall.
That’s a conversation our Service Advisors are built for. If the smart move is to fix the one problem, we’ll tell you that. If the smart move is to step back and look at whether the repair is worth it, we’ll tell you that too.
Read: Is my car worth fixing? for a simple way to think through the repair-or-replace decision.
Augusta
1853 Gordon Highway
Augusta, GA 30904
(706) 738-7812
Grovetown
303 Grimaude Blvd
Grovetown, GA 30904
(706) 303-3333
Read Our Guide:
Is my car worth fixing?
Faqs
Frequently Asked Questions
My spare is flat too. What now?
It happens more than you’d think, because spares lose air just sitting unused, and a lot of drivers never check them. If your spare is low or flat, don’t risk driving on it. Call for roadside help or a tow.
Once you’re in, it’s a good moment to have the whole tire situation looked at, the flat, the spare, and the tread on your other tires, so you leave with a set you can trust.
How far can I drive on a donut spare?
Most compact spares are rated for around 50 miles, but check the sidewall of your spare and your owner’s manual, because the exact number varies by vehicle. Treat it as a ceiling, not a goal.
The point of a donut is to get you off the side of the road and to a shop, not to keep driving on for days. The sooner the real tire is handled, the sooner you’re back on a safe, matched set.
Why is my check engine light blinking?
A blinking light almost always means the engine is misfiring. When that happens, unburned fuel reaches the catalytic converter and overheats it, and that part is expensive to replace. Common causes are a worn spark plug, a failing coil, a bad fuel injector, or an air leak. A quick scan gets you to the zip code of the problem. Testing & Analysis is what gets you to the front door. Guessing from the code alone is how people end up paying for parts that weren’t the issue.
Can I drive on the highway with a spare tire?
Not on a compact donut. It’s built for low speeds, usually under 50 mph, and highway speeds put more heat and stress on it than it’s designed to handle. It also gives you less grip and longer stopping distances.
A full-size spare is fine at normal speeds as long as it’s properly inflated and in good shape. When in doubt, check the sidewall of the spare for its speed rating.
What happens if I leave the donut on too long?
A donut gives you less traction and longer stopping distances, and it throws off the balance between your wheels, which can affect braking and add wear over time. It’s a get-you-home part, not a long-term tire.
Driving on it well past its intended range turns a minor inconvenience into a safety issue. Our guide on delaying repairs walks through how small problems grow when they’re put off: What happens if you delay car repairs?
How do I know if a warning light means stop now?
A flashing light is more urgent than a steady one. A flashing check engine light means an active misfire that can damage the catalytic converter within minutes, so that one means stop.
An oil pressure light, a temperature warning, or a brake or battery light that stays on also mean stop and get help.
Our guide on the check engine light explains steady versus flashing in more detail: Can I Drive With Check Engine Light On?
What car problems are the most dangerous to ignore?
Brakes, steering, overheating, tires, and certain warning lights are the ones that should never wait. Brakes and steering affect your control of the vehicle right now. Overheating can destroy an engine within minutes of continued driving. A tire bulge can blow out at speed.
A flashing check engine light, an oil pressure light, or a temperature warning also mean stop. Most other problems can wait a few days, but these should be looked at right away.
Can my flat tire be repaired, or do I need a new one?
It depends on the damage. A nail or screw in the tread can often be repaired with a plug or patch, which costs a fraction of a new tire. A puncture in the sidewall, a bulge, or tread worn past its limit means the tire needs to be replaced, because those can’t be fixed safely.
At [atc] AutoCenter, our ASE-certified technicians will show you the damage and tell you honestly which one it is. If it’s repairable, we repair it.
If money is tight, how do I know which repair to do first?
That’s exactly the conversation we’re built for. At [atc] AutoCenter, we sort every finding into safety now, do soon, or monitor, so you know which repairs genuinely can’t wait and which can be planned for.
You get a written report and a written estimate, and nothing is started without your approval. The honest answer is rarely fix everything at once. It’s fix what keeps you safe first, then plan the rest.
What should I do if my temperature gauge goes into the red?
Pull over safely as soon as you can and turn the engine off. An overheating engine can suffer serious damage within minutes, so don’t try to make it home.
Let it cool down before you do anything else, and call for help or a tow. Continuing to drive on an overheating engine is one of the most expensive mistakes you can make.
Can I drive to the shop with a steady check engine light on?
Short distances, yes. A steady light means something needs attention, but the car usually isn’t hurting itself right this second. Go easy on the gas, skip long highway stretches, and get in within a day or two. If the light starts blinking while you’re driving, that changes things right away. Pull over and call.
Will the check engine light turn off by itself after a repair?
Usually, yes. Once the problem is fixed, most cars clear the light on their own after a few days of normal driving. A technician can also clear it right away with a scan tool once the repair is confirmed. If the light comes back after being cleared, the real cause wasn’t fixed, and it needs another look.
What does it cost to have a check engine light checked at [atc]?
It depends on how involved the problem is. Reading a simple code is one thing. Tracking down an on-and-off misfire or an emissions issue takes more time. Your Service Advisor will confirm the fee before any work starts, and you’ll get a written estimate for the repair before we touch anything. Most check engine light appointments are same-day.
My check engine light came on and then turned off. Is the problem gone?
Not necessarily. The light going off just means the car stopped seeing the problem for now. Some issues come and go, and they usually come back. A sensor on its way out, for example, can flip the light on and off more and more often until it fails for good, and by then a costlier part may be affected too. If the light came on at all, get the codes checked before driving much further. Even if nothing shows up live, a technician can pull the stored history.