
Check Engine Light

First, Relax.
When the check engine light comes on, it doesn’t mean you have to pull over immediately and abandon your vehicle. But it means you should get the vehicle checked as soon as possible. By ignoring that little amber light that either says “check engine” or shows an icon of an engine, you could damage expensive components of your car. Also known as the malfunction indicator lamp, the check engine light is an indication from the car’s engine computer that something is amiss. It’s part of your car’s onboard diagnostics system. Besides turning on the amber light, your car’s computer stores a “trouble code” in its memory which your Lithia auto mechanic can access to figure out the source of the problem. The auto industry created a standardized system for diagnosing trouble codes called OBD-II back in the late 1990s that created trouble codes that can be read through the use of a universal connector.
Reading the Codes
To read the codes, your mechanic plugs a scan tool or code reader into the 16-pin OBD-II diagnostic connector usually located under the dash near the steering column. The scan tool displays the specific codes that caused your check engine light to come on. Software (and hardware) that is required to read the codes can vary depending on the year, make and model of your vehicle. You can check these codes yourself by buying a code reader from any auto parts store or online that connects to the Onboard Diagnostics (OBD) port. You can find all the code meanings online, or use a Code Reader app on your smartphone. But just reading the codes is not enough. All makes and models of cars are not the same and it takes a trained technician to know what those codes really mean to your specific car and how to make proper repairs.
Common Reasons for a Check Engine Light to come on
- Tripping sensors for the gas cap
- Oxygen sensor
- Catalytic converter
- Ignition coil
- Purge control valve
- Mass airflow sensor
- Fuel injector
- Thermostat
What is the most common reason for check engine light?
Believe it or not, the number one reason why a check engine light comes on is that you have a loose gas cap. It keeps the whole fuel system under correct pressure. Inspecting and tightening the gas cap may make the check engine light go off.
Is it OK to drive with check engine light?
Generally speaking, yes. The check engine light is triggered when the car’s computer senses a problem in the operating system. Most common reasons that the light comes on include an oxygen sensor failure, loose gas cap, catalytic converter failure, mass airflow sensor failure, exhaust system leak, spark plug or ignition coil issue. While you can still drive the vehicle, suggest you take it in to run a diagnostic test right away.
Is a check engine light serious?
It can be. When the check engine light comes on, it means yout car’s computer senses a problem with your vehicle’s emissions or electrical system. A misfiring engine can overheat the catalytic converter, causing it to fail and that can lead to damage to the engine. Don’t ignore the check engine light. Take your vehicle in and have a technician run an OBD-II diagnostic scan to determine which error codes have been triggered.
What do I check when the check engine light comes on?
First, check your gauges to see if you have low oil pressure or if the car is overheating. If these issues are present, turn off the car immediately. Check the alternator and serpentine belt. Check the oxygen sensor. It measures unburned oxygen in the exhaust system. A faulty oxygen sensor can make your car burn more gasoline. Check the catalytic converter. A faulty unit can cause reduced fuel economy and can cause the car to overheat. If the mass airflow sensor goes bad it can damage the spark plugs, O2 sensor, and catalytic converter.
What does a solid yellow check engine light mean?
A solid yellow check engine light means you should have the car checked as soon as possible. A flashing yellow light may mean the vehicle is misfiring and that can cause poor performance and poor fuel economy at the very least. If the check engine light comes on, have your car checked by a certified technician right away. Schedule an appointment with your local Lithia Motors dealer.
Why is my engine light on but nothing seems wrong?
The check engine light may come on for a number of reasons and not all of them are serious. If it comes on while you are driving, don’t panic. Pay attention to how your car is behaving. Is the engine surging? Is it overheating? The problem could be as simple as that your gas cap is loose and needs to be tightened. However, the problem might also be serious and continuing to drive with the check engine light on can cause damage to your engine. Don’t ignore the check engine light. Have the car checked right away with a diagnostic scan at your local Lithia Motors dealer.