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My BMW’s check engine light is on. What’s triggering it?

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European Auto Care • February 6, 2025
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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!

European Auto Care Blog

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Common Mini Cooper Issues and How to Address Them

By European Auto Care • January 4, 2025
Mini Coopers are renowned for their stylish design, fun handling, and compact convenience, making them a favorite among drivers. However, like any vehicle, they are not without their quirks. At European Auto Care in Lewisville, TX, we specialize in Mini Cooper service and repair, helping owners address common issues and keep their cars running smoothly. Here are some of the top troubles Mini Cooper owners may encounter. Engine Cooling Issues Mini Coopers are prone to problems with the cooling system, including radiator leaks and water pump failures. Overheating can cause significant engine damage, so it's important to address any coolant leaks or overheating issues promptly. Regular cooling system inspections can help prevent these problems. Timing Chain Tensioner Failure A common issue in Mini Coopers, especially in earlier models, is timing chain tensioner failure. This can cause a rattling noise from the engine and, if left unchecked, may lead to severe engine damage. Routine engine maintenance can help catch this issue early and prevent costly repairs. Transmission Troubles Automatic Mini Coopers, particularly older models, are known for transmission issues, including hard shifting or complete failure. Regular transmission fluid changes and inspections can help extend the life of the transmission and ensure smooth operation. Electrical System Glitches Mini Coopers are also known for electrical problems, such as faulty power windows, issues with central locking, and dashboard warning lights. These can often be traced to failing sensors or wiring issues, which our team at European Auto Care can efficiently diagnose and repair. Carbon Build-Up in the Engine Direct-injection engines in Mini Coopers can experience carbon build-up over time, leading to reduced performance and fuel efficiency. Periodic engine cleaning can mitigate this issue and help your Mini perform at its best. If you’re experiencing any of these common Mini Cooper troubles, bring your vehicle to European Auto Care in Lewisville, TX. Our team of experts provides professional diagnostics, repairs, and maintenance to keep your Mini running like new. Give us a call at  972-316-7541  to schedule an appointment or to request a quote for the cost of Mini repair in Lewisville or any nearby Texas town.
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