Why Is My Check Engine Light On? Causes and Fixes for Redding Drivers
Find Out Exactly Why Your Check Engine Light Is On
Your car's computer stores a trouble code when something is out of range. The code points us in a direction; testing confirms the cause before you pay for a repair.
Steady light and the car drives normally: you're usually OK for a few days, but book soon. Flashing light: stop driving and call us.
Why is my check engine light on? Your car's computer has found a problem with the engine, fuel, ignition, or emissions system. The most common causes are a loose gas cap, a failing oxygen sensor, worn spark plugs or ignition coils, and vacuum leaks. A steady light means book soon; a flashing light means stop driving.
The check engine light means your car's computer has spotted a problem with the engine, fuel, ignition, or emissions system. A steady light means "get it checked soon." A flashing light means the engine is misfiring badly enough to damage the catalytic converter, so it needs attention right away.
Common causes of a check engine light
- A loose or worn gas cap. It lets fuel vapor escape and is the easiest fix there is.
- A failing oxygen sensor. One of the most common causes, and it hurts gas mileage if ignored. Emissions repair
- Worn spark plugs or ignition coils. These cause misfires and rough running. See rough idle or misfire.
- A vacuum leak or faulty mass airflow sensor. These throw off the fuel mixture.
- A catalytic converter problem. Often caused by another problem that went unfixed.
Light came on?
Book a check engine light diagnosis and find out what it means before it gets more expensive.
How we find the cause and fix it
- We read the stored codes and the freeze-frame data saved when the light came on.
- We test the system the code points to, because a code alone doesn't tell you which part failed. Check engine light diagnostics
- We show you what we found and give you a written estimate before any repair.
- After the repair, we clear the code and confirm the light stays off.
Get a real answer, not just a code.
Book a diagnosis. You'll see what we found before we fix anything.
Is it safe to keep driving?
With a steady light and a car that drives normally, you can usually drive to us, but book soon: small problems like a bad sensor can turn into expensive ones. If the light is flashing, or the car is running rough, losing power, or overheating, stop driving and call us.
Services we offer that could fix your problem
We confirm the cause first, then recommend only the repair you need.
- Check Engine LightFind Out Exactly Why Your Check Engine Light Is OnLearn more
- Engine DiagnosticsGet a Clear Answer About What's Wrong With Your EngineLearn more
- Computer DiagnosticsStop Guessing and Find the Real Problem FastLearn more
- Emissions RepairPass Your Smog Check Without the StressLearn more
Common questions
Why Is My Check Engine Light On?
Your car's computer has found a problem with the engine, fuel, ignition, or emissions system. The most common causes are a loose gas cap, a failing oxygen sensor, worn spark plugs or ignition coils, and vacuum leaks. A steady light means book soon; a flashing light means stop driving.
Is it safe to drive with the check engine light on?
If the light is steady and the car drives normally, usually yes, for a short time. If it's flashing or the car runs rough, stop driving and call us: a severe misfire can damage the catalytic converter.
Can a loose gas cap turn on the check engine light?
Yes. A loose or worn cap lets fuel vapor escape and sets an evaporative emissions code. Tighten it, and if the light doesn't go off after a few drives, have it checked.
Will the light go off by itself?
Sometimes, if the problem was temporary. But the code stays stored, and the cause often comes back. It's worth reading the code even if the light goes off.