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The ‘service engine soon‘ light on the BMW dashboard is a part of BMW’s onboard diagnostic (OBD) system that detects malfunctions in the vehicle and conveys them through dashboard lights. The OBD system constantly monitors the sensor feedback of the engine and its related components against manufacturer parameters. If any discrepancy is found, it triggers the dashboard ‘service engine soon’ light.
The light indicates that some irregularities in the engine function need your attention as a BMW owner. This light does not indicate a catastrophic failure that needs instant attention. A rapidly blinking check engine light is the indication of that. However, if this warning is ignored, then the issue could progress to a catastrophic failure.
To properly address the ‘service engine soon’ light, you must understand the underlying causes that trigger the light.
Top Causes of ‘Service Engine Soon’ Light On
- Loose or Faulty Gas Cap: Although a loose or damaged gas cap may seem insignificant, it is one of the reasons the light could be triggered. It causes the fuel vapour to escape, which triggers the OBD system.
- Faulty Oxygen Sensor: The oxygen sensor monitors the amount of oxygen that mixes with the fuel for proper combustion. A malfunctioning sensor fails to provide accurate feedback, triggering the OBD to illuminate the ‘service engine soon‘ light.
- Catalytic Converter Issue: Catalytic converter reduces the harmful emissions released from the vehicle by converting them into non-toxic substances. This component is primarily part of the emission system that works in tandem with the engine. A malfunction in the catalytic converter, due to age or damage, affects engine performance, which in turn triggers the ‘Service Engine Soon’ light.
- Spark Plug Issues: A faulty spark plug causes misfires in the engine. This reduces the engine’s performance and fuel efficiency. This, in turn, triggers the dashboard light.
- Vacuum Leak: A Vacuum leak can disrupt the air-fuel mixture, resulting in improper combustion. This causes rough idling and engine misfire. Leakages also allow contaminants to enter the engine, potentially damaging it. This causes the OBD to turn on the ‘service engine soon’ light.
- EGR Valve Issue: The exhaust gas regulation, or EGR valve, recirculates some of the exhaust gas back into the engine to achieve proper combustion and fuel efficiency. A malfunction in this valve causes an irregular amount of exhaust gases to be released. This disrupts the engine function, causing the ‘service engine soon’ light to turn on.
Beyond the dashboard light, an engine malfunction results in a reduction of engine output, a decrease in fuel economy, unusual noise, and unusual smells. If the issues persisted, it could lead to engine seizure due to catastrophic malfunction.
What to Do When ‘Check Engine Soon’ Light Turns On?
Upon seeing the service engine light turn on in your BMW, consult an expert technician at a specialized BMW auto service shop, such as Bimmer Performance. The technicians go through several procedures to rectify the malfunction that triggered the ‘service engine soon’ light. These procedures include;
The first step of the repair process is the diagnostic inspection. Using a BMW-specific factory-grade scanner, the error codes in the OBD module are read. Analysis of the codes provides insights into the damage, its cause, and point of origin. Component-specific testings are done to analyze the damage further and determine the repair method.
Upon identifying the issue, the repair process ensues. Depending upon the type and extent of the damage, the components are either repaired or replaced. It is recommended to use OEM-made parts and components for repairs and replacements in your BMW, as other low-quality components may not be compatible with the European brand. After completion of repairs, fluid devices are used to restore the fluids to the optimal level.
Houston’s Premier BMW Service Facility
If you are concerned about the ‘Service Engine Soon’ 
dashboard light in your BMW, don’t worry, and visit us at Bimmer Performance in Houston. We are Houston’s premier auto service shop for luxury high-performance cars and SUVs. We specialize in working with European vehicle brands, with a particular focus on BMW.
Our shop employs certified specialist mechanics with years of experience working on BMW cars. Our shop has factory-grade diagnostic scanners, top-of-the-line tools, and brand-licensed software for accurate diagnosis and repair of all your BMW issues. Operating from 1320 Upland Drive in Houston, we also welcome BMW owners from surrounding cities, such as Cinco Ranch, Cypress, Katy, and Sugar Land, for auto repair and services at Bimmer Performance.