Or it could be something more serious that requires you to take your vehicle in for repair. If you have any questions about your check engine light, we're here to help.
What is a Check Engine Light?
A check engine light (or CEL) is an indicator light on most vehicles that tells you when your car has a problem. A CEL usually comes on when two things happen: 1.) Your vehicle has been diagnosed with a malfunctioning component, such as a faulty oxygen sensor, or 2.) You've exceeded the manufacturer-recommended number of miles per year for your vehicle.
How Does a Check Engine Light Work?
When your vehicle's computer detects a malfunctioning component, it will turn on the check engine light. Your car needs to be taken to a mechanic for repairs. If you exceed the recommended mileage for your vehicle, the check engine light will also illuminate. In this case, your vehicle will need to be brought in for service.
Why Do I Have a Check Engine Light On My Car?
If you have a check engine light on your dashboard, it could mean that your vehicle is experiencing problems with one of its components. These components include:
Oxygen sensors - Oxygen sensors measure how much oxygen is in the air entering your vehicle's cylinders. When these sensors fail, they won't detect whether or not the mixture of fuel and air is correct. As a result, your vehicle will run leaner than usual, which causes excessive emissions.
Catalytic converters - Catalytic converters convert harmful exhaust fumes into harmless gases. They work by using precious metals like platinum to remove pollutants from the exhaust stream. Over time, catalytic converters become clogged up with soot and other debris. It reduces their effectiveness, causing them to emit more pollutants than before.
Malfunctioning OBDII system - An OBDII system monitors your vehicle's performance and safety systems. Malfunctions occur when the computer malfunctions, meaning it doesn't recognize specific signals from your vehicle's sensors. For example, if your vehicle's ABS brakes don't function properly, the computer might think that your car is braking normally.
Malfunctioning ECU - An electronic control unit (ECU) controls all aspects of your vehicle's operation. Malfunctions occur when a computer chip inside the ECU fails. It can cause your car to perform poorly, including stalling while driving.
In addition to these components, there are several other possible causes of a check engine light. Some of these include:
Faulty wiring - Harnesses can break down over time, causing electrical shorts. The resulting short circuit can damage your vehicle's computer.
Defective ignition module - Ignition modules are responsible for starting your vehicle's internal combustion engine. If they fail, your car may not start at all.
Defective battery - Batteries can wear out over time, causing them to lose capacity. It can lead to poor performance and reduced power.
Poor gas quality - Poor gas quality can cause your vehicle's computer to malfunction.
What Should I Do If I See a Check Engine Light?
If you see a check engine light coming on and off, take your vehicle to a mechanic as soon as possible. Your mechanic should inspect the following areas:
Engine bay - Look under the hood for any leaks or corrosion.
Exhaust pipe - Examine the exhaust pipe for cracks or holes.
Fuel filter - Inspect the fuel filter for blockages or damage.
Transmission fluid - Check transmission fluid levels for proper amounts.
Transmission oil - Check transmission oil level for the appropriate amount.
Tire pressure monitoring system - Verify that the tire pressure monitoring system is working correctly.
Brakes - Test brake pads for wear.
Steering wheel - Make sure the steering wheel has no defects.
Battery - Check battery voltage for proper readings.
Ignition switch - Check that the ignition switch is functioning correctly.
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