European Auto Care Blog

A BMW's check engine light is an important indicator of potential issues under the hood. When it illuminates, it can range from minor concerns to significant problems that require immediate attention. In this situation, it’s best to promptly visit the shop for diagnostics so the underlying issue doesn’t get the chance to worsen. At European Auto Care, we provide expert European check engine light diagnostics and repair in the greater Lewisville, TX area. Here are five common reasons why your BMW’s check engine light might come on. Faulty Oxygen Sensor The oxygen sensor in a BMW measures the level of unburned oxygen in the exhaust system, helping the engine maintain an optimal air-fuel mixture. If this sensor becomes faulty, it can cause the engine to run inefficiently, potentially increasing fuel consumption and emissions. A failing oxygen sensor is one of the most frequent reasons for the check engine light to appear and should be replaced quickly to avoid further complications, such as problems with the catalytic converter. Malfunctioning Mass Air Flow Sensor The mass air flow (MAF) sensor is responsible for monitoring the amount of air entering the engine and ensuring the correct fuel-to-air ratio. When this sensor malfunctions, the engine may misfire, idle roughly, or have reduced performance. If the check engine light is on and your BMW’s performance seems off, this component might be the culprit. Loose/Missing/Damaged Gas Cap A loose or damaged gas cap is a surprisingly common reason for the check engine light to come on in BMWs. The gas cap seals the fuel system and if it isn’t properly secured, fuel may evaporate before your engine gets the chance to use it. Failing Catalytic Converter The catalytic converter plays a crucial role in reducing harmful emissions by converting toxic gases into less harmful substances. If the catalytic converter is failing, the check engine light will likely illuminate, and you may notice reduced engine performance or a smell similar to rotten eggs. Ignition Coil or Spark Plug Issues BMW engines rely on properly functioning ignition coils and spark plugs to ignite the air-fuel mixture in the cylinders. If either of these components fails, it can cause misfires, rough idling, or difficulty starting the car. The check engine light will illuminate if the onboard computer detects ignition issues, signaling the need for immediate repairs. BMW Check Engine Light Repair in Lewisville, TX When you need BMW repair in Lewisville and the surrounding area, contact European Auto Care at  972-316-7541  . Feel free to give us a call to make an appointment for your BMW repair and maintenance needs in Lewisville, TX!