Your car, truck, or utility vehicle has a main computer chip called the engine control unit. This chip monitors system sensors to make certain everything is operating as it should be. If something goes wrong, a sensor will report an error to the engine control unit. The unit will then turn on a dashboard warning light, such as the check engine light, to alert you of the problem. Let’s talk about the parts and systems that will cause the engine control unit to turn on the check engine light.
Catalytic Converter
For example, assume for the moment that your catalytic converter is clogged. The engine control unit will receive the error code and turn on the check engine light because the catalytic converter does not have a light of its own.
EVAP Control System
The same is true with the EVAP control system. If it malfunctions, you’ll end up with a check engine warning. The EVAP control system is in charge of ensuring gasoline or diesel fuel does not evaporate from the engine.
Engine Control Unit
Oddly, the engine control unit will turn on the check engine light if it malfunctions. Aside from the dashboard warning, your engine may also die and refuse to restart. Unfortunately, you’ll need to replace the engine control unit.
Gas Cap
Another thing that prevents your fuel from evaporating is the gas cap. This cap creates a seal over the gas tank to ensure no fuel evaporation makes its way into the environment. If the cap is old, it may not be able to create a seal anymore.
Mass Airflow Sensor
The mass airflow sensor can get dirty because it is located directly behind the air filter. If the mass airflow sensor goes bad, your engine may struggle to run and the check engine light will turn on.
Oxygen Sensor
The oxygen sensor has a different job. Instead of checking the air inflow, it measures how much oxygen is in the vehicle’s exhaust. The O2 sensor is a common reason for check engine warnings. The O2 sensor lasts about 100,000 miles.
Spark Plugs
Finally, it’s not uncommon for the engine control unit to turn on the check engine light if the spark plugs are misfiring. Things that will cause the spark plugs to misfire include wear and tear as well as a problem with the engine control unit.
Speed Auto Repair is the best auto service shop in Alpharetta, GA, and the best auto service shop in Roswell, GA. Call the shop closest to you today to schedule an appointment if your check engine light is on.