What Does the Check Engine Light Mean?

The Check Engine Light (or malfunction indicator lamp) turns on when your vehicle's Engine Control Unit (ECU) finds something wrong. The ECU is fed by sensors; when a sensor gives an incorrect reading, the ECU turns on the Check Engine Light and stores a special code.

What Causes the Check Engine Light To Turn On?

There are many potential reasons why a Check Engine Light may turn on. These are a few of the most common, but they're far from the only reasons.

• Bad Spark Plugs
• O2 Sensor Failure
• Catalytic Converter Failure
• Loose, Cracked, or Missing Gas Cap
• Ignition Coil Trouble
• Faulty Thermostat
• Faulty Mass Airflow Sensor
• EGR Valve Failure

How To React When the Check Engine Light Comes On

When the Check Engine Light in your vehicle turns on, you should come to Feldman 1 800 Preowned Supercenter. Our technicians will read the code that the ECU stores, and then visually inspect the source of trouble.

If the Check Engine Light is solid, you can wait until you arrive at your destination to schedule an appointment. It's still important to bring your vehicle in as soon as you can since the Check Engine Light usually means that there is a problem that affects your vehicle's emissions, fuel efficiency, or engine power. However, if the Check Engine Light is flashing, we recommend that you pull over and turn off the engine as soon as you can; then, call for a tow truck. A flashing Check Engine Light usually means that the engine is misfiring, which can damage your catalytic converter.