You're cruising down Route 896, coffee in hand, and there it is: that little orange engine glowing on your dash. Is it a loose gas cap or a big repair bill waiting to happen? The honest answer is "it depends," and the only way to know for sure is to find out what your car is actually trying to tell you.
Here's a quick guide to what the light means, when to worry, and what to do next.
Solid vs. flashing: the most important difference
A solid light means your car's computer has spotted a problem and stored a trouble code. It's not an emergency, but it's not something to ignore for months either. Book a diagnostic soon.
A flashing light is your car shouting. It usually means the engine is misfiring badly, which can send unburned fuel into the exhaust and overheat the catalytic converter, one of the pricier parts to replace. If it's flashing, ease off, avoid hard acceleration, and get it checked right away. If the car is shaking or running rough, it's safer to have it towed.
Common reasons the light comes on
- A loose or worn gas cap. Yes, really. Tighten it until it clicks and give it a few drives.
- Worn spark plugs or ignition coils. These cause misfires and are a frequent cause of a flashing light.
- A failing oxygen sensor. It helps your engine get the fuel mix right, and a bad one can hurt your gas mileage.
- An evaporative (EVAP) system leak. Small leaks in the fuel vapor system are a very common code.
- A dirty or failing mass airflow sensor. Can cause rough idling, stalling or hesitation.
- Catalytic converter trouble. Often the result of another problem that was left too long.
"The auto parts store already read the code. Isn't that enough?"
A code is a clue, not a diagnosis. A misfire code tells you which cylinder is unhappy, but not why. It could be a plug, a coil, an injector or a vacuum leak. Throwing parts at a code gets expensive fast. Our technicians use professional diagnostic equipment and testing to pinpoint the actual cause, so you only pay to fix what's broken.
Heads up for Delaware inspection
Delaware's DMV inspection checks your car's onboard computer, so a lit check engine light can keep you from passing. If your inspection date is coming up, get the light checked first and save yourself a second trip to the inspection lane.
What happens when you bring it to Peak
- We scan the codes and look at the live data from your engine.
- We test to confirm the cause instead of guessing.
- We explain it in plain English, including what's urgent and what can wait.
- We fix it right, and qualifying repairs are backed by our 3-year / 36,000-mile TechNet nationwide warranty plus TechNet Roadside Assistance.
Why Newark drivers trust Peak
- 4.8 stars from 470+ Google reviews
- ASE-certified technicians, all makes and models
- 663 Dawson Dr., Newark, DE 19713, serving Newark, Bear, Glasgow, Christiana and Wilmington
- Open Monday to Friday, 8 AM to 6 PM
- Sign up for eSpecials and get $5 off any service or repair
Check engine light FAQ
Can I keep driving with the check engine light on? If it's solid and the car drives normally, you can usually drive it to the shop. If it's flashing, or the car is shaking, losing power or overheating, stop driving and call us.
Why did my check engine light come on after an oil change? Sometimes it's a coincidence and something unrelated set a code. Sometimes a cap or connector wasn't seated fully. Either way, a quick scan tells us which.
Will the light turn off by itself? Some codes clear on their own once the problem goes away, like a tightened gas cap. If the light stays on, the problem is still there.
Is it safe to just clear the code? Clearing it only turns off the light. The problem is still there, and the car may not be ready for inspection right after a reset.
Don't let that little light stress you out
Let us figure out what your car is saying, so you can get back to your day.
Call now: (302) 731-8822
Book now: peakautorepairs.com/appointment
Related: Learn more about our diagnostic services in Newark, DE, or read the Delaware car inspection checklist and 7 transmission warning signs.