Common Problems That Turn On the Check Engine Light

The check engine light is a catch-all to cover problems that don’t have warnings of their own. Mark’s Auto Service can determine why your check engine light came on by running a diagnostic test. This test returns error codes submitted by system sensors and points us directly to the problem. This makes resolving the issue quicker and easier. Here are common problems that turn on the check engine light.

Catalytic Converter

The catalytic converter takes the toxic emissions in your vehicle’s exhaust and converts them into safe emissions. This part lasts about 10 years. After this time, it will either malfunction or clog, and you will end up with the check engine warning on the dashboard.

EVAP System

The EVAP system prevents fuel from evaporating into the environment. If this system malfunctions, you will end up with the check engine warning. A failing EVAP system can also create problems with your vehicle’s emissions and any emissions test it must take.

Engine Control Unit

The engine control unit is your vehicle’s main computer chip. This is the chip that communicates with all of the system sensors. The check engine light is actually turned on by this chip, but the light will also turn on if the engine control unit is faulty.

Fuel Cap

If your check engine light came on once you finished filling your gas tank, it’s possible that you didn’t screw the gas cap on correctly. This cap must create a seal over the gas tank to prevent the gasoline from evaporating out of it.

Mass Airflow Sensor

The mass airflow can get dirty, and, as a consequence, turn on the check engine light. You may also notice engine performance issues such as sputtering and black exhaust smoke.

Oxygen Sensor

The oxygen sensor can also create these problems. The mass airflow sensor can last a lifetime if you take care of your automobile, but the oxygen sensor can go bad at around 90,000 to 100,000 miles. A faulty sensor will turn on the check engine light.

Spark Plugs

Spark plugs that are worn will misfire. When this happens, your engine will misfire and stall. You will also end up with the check engine warning on the dashboard. It’s important to have the worn spark plugs changed right away to restore your engine’s performance.

Mark’s Auto Service has two auto service shops in Illinois to serve you. Call the shop closest to you, whether Rockford or Loves Park, today to schedule an appointment for your automobile if the check engine light is on.


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