When the check engine light shows up on your dashboard, it's worth taking the time to get down to the bottom of the issue. A check engine light can signal that something is wrong with your engine. While some issues are less critical than others, ignoring your check engine light can lead to significant engine damage and more expensive repairs down the line. Luckily, Eurotech Auto Service is here to provide you with the top 8 reasons why your check engine light may be on. Faulty Oxygen Sensor If your oxygen sensor isn't functioning right, your vehicle won't be able to gauge the right amount of oxygen to inject the proper volume of fuel into the engine. Consequently, it can significantly decrease your gas mileage. Loose Gas Cap Leaking gasoline vapors can flag the fuel sensors if the gas cap is loose or damaged. Damaged Catalytic Converter A malfunctioning catalytic converter can trigger your check engine light, but it's also very dangerous. Be sure to take your car to an auto repair shop as soon as possible. Otherwise, you might inhale nasty and hazardous fumes. Faulty Ignition Coil Coils fail over time and under extreme engine temperatures, causing a lack of spark to run the engine.  Old Spark Plug Similar to the coil, your spark plug provides electricity that kindles the air-fuel mixture in your car's engine.  Defective Mass Air Flow Sensor Like the oxygen sensor, this type of damage can decrease your mileage and trigger the engine light. Faulty Exhaust Gas Recirculation Valve Without this component, the exhaust will revert back to the combustion process, causing your fuel economy to decrease. Battery Charging System Some sensors can also detect issues with your battery and warn you via the check engine light.   Check Engine Light Repairs in Eurotech Auto Service If your check engine light is lit, please call or visit our auto repair shop today. We have three convenient auto repair shop locations in New Brighton, MN, Woodbury, MN, and Medina, MN.