The check engine light is a signal that the onboard diagnostics system (or OBD II) has detected a malfunction in the vehicle’s emissions, ignition, fuel or exhaust systems. … All cars and light trucks have onboard diagnostics that are supposed to detect engine-related problems that affect the emissions control systems.
What is the most common reason for check engine light?
Replacing a faulty oxygen sensor — a sensor used to optimize a vehicle’s fuel-to-air mixture to increase gas mileage and reduce emissions — is the most common cause for a check engine light.
Is it safe to drive with check engine light?
Can you drive a car with the engine light on? It’s okay to drive for a few miles, but be sure to schedule an inspection of the engine as soon as possible. If the check engine light comes on while you’re driving, don’t panic! … Just be sure to have your car inspected as soon as possible after the light turns on.
Can low oil cause the check engine light to come on?
Low oil pressure: If your car is low on oil, it can cause your check engine light to go off. This is often shown in its own glowing light along with the check engine light on the dashboard. Overheating: If your car’s engine temperature is heating up, it can once again trigger the check engine light.
Why is my engine light on but nothing seems wrong?
Normally, the appearance of a check engine light indicates a problem somewhere in your vehicle, but nothing seems amiss. … The problem can even be as simple as forgetting to tighten your gas cap – in fact, this is the most common reason why check engine lights appear in the first place.
What does a solid yellow check engine light mean?
The steady yellow light is telling you to take a look and fix the minor issue as soon as you can, but it’s not usually serious. The flashing light means that your vehicle’s engine is misfiring and you should investigate the problem immediately.
How serious is check engine light?
The check engine light — more formally known as the malfunction indicator lamp — is a signal from the car’s engine computer that something is wrong. … If the light begins flashing, however, it indicates a more serious problem, such as a misfire that can quickly overheat the catalytic converter.
Can AutoZone check engine light?
Does AutoZone Scan Check Engine Lights? AutoZone does. If your light is on, and you are wondering why, head down to your local AutoZone where one of our store associates can help diagnose the issue through our free Fix Finder service.
What should I do if my check engine light comes on?
If the check engine light comes on, here are some tips on what you should do:
- Look for a serious problem that requires immediate attention. …
- Try tightening your gas cap. …
- Reduce speed and load. …
- Use built-in diagnostic services, if available.
How much does it cost to check engine light?
On average, the fee to have an auto mechanic diagnose a check engine light is $100.