Can a Loose Fuel Cap Make the Check Engine Light Come On?

Yes, if your fuel cap is not screwed on tightly, the engine control unit will turn on the check engine light to alert you that the fuel is evaporating out of the tank. Shums Auto Repair advises that this is just one reason why the check engine light will turn on. We are going to list the other common reasons below, all of which we can diagnose through a diagnostic test.

Faulty Catalytic Converter

The catalytic converter treats your engine’s exhaust before it is released via the exhaust system. Over time, carbon builds up inside the converter and clogs it. This will cause the catalytic converter to malfunction, and you will end up with a check engine warning as a result.

Faulty EVAP Control System

The EVAP control system is found in newer automobiles to ensure that the gasoline or diesel fuel does not evaporate into the environment. If this system malfunctions, you will receive a check engine warning. You might also experience engine performance problems.

Faulty Engine Control Unit

The main computer chip in your car, truck, or utility vehicle is the engine control unit. This chip communicates with the system sensors to make sure everything is operating as it should be. If the chip malfunctions, your check engine light will turn on. The faulty chip will also cut your engine.

Faulty Mass Airflow Sensor

The mass airflow sensor is also referred to as the MAF sensor. As its name suggests, it measures the air inflow into the engine from the outside. If the sensor gets dirty, it can malfunction and send incorrect data to the engine control unit. The dirty MAF sensor will also cause a check engine warning.

Faulty Oxygen Sensor

The oxygen sensor is also referred to as the O2 sensor. This sensor measures how much oxygen is being released in your vehicle’s exhaust. On average, the O2 sensor will last about 100,000 miles in newer automobiles. Once it goes bad, the check engine light will turn on.

Worn Spark Plugs/Wires

Finally, another common reason for a check engine warning is worn spark plugs and wires. Today’s spark plugs last as long as 100,000 miles before they need to be replaced. Nonetheless, if you fail to replace them when it’s time, your check engine light will turn on and your engine will misfire.

Shums Auto Repair is the best auto service shop in Philadelphia, PA, so call us today if your check engine light is on. We will find the reason for the check engine warning and fix it.

Photo by StushD80 from Getty Images via Canva Pro

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