Why Is My BMW Check Engine Light On?

There are several distinct recognized causes of a Check Engine Light, including malfunctioning emissions control components, a failure with the fuel injection system, defective spark plugs, a filthy mass airflow sensor, a damaged oxygen sensor, a faulty head gasket, and more.


The most frequent causes of the BMW Check Engine Light include: * A loose, broken, or missing gas cap

The fuel injection system, defective emissions control components, a dirty mass airflow sensor, and defective ignition systems are additional common causes of a check engine light.

Reasons for Checking Your Vehicle Possible Engine Light On

The check engine light on your car may have come on for a number of different reasons. Some of the most frequent reasons for your check engine light to illuminate are listed below:

  • Gas cap that is loose, broken, or missing. The gas lid keeps fuel from evaporating out of the tank. In order to maintain pressure, it also seals the gasoline tank. If the check engine light comes on, one of the first things you should look for is the gas cap. Ensure that it is safe.
  • defective head gasket. The cylinder heads and engine block are separated by the head gaskets. If the head gasket on your car has ruptured, there may be an oil or coolant leak, or the coolant and oil may be mixing.
  • Oxygen sensor damage. The oxygen sensor gauges the amount of oxygen in the exhaust system of your car. This will decrease the fuel efficiency of your car if there is too much oxygen in the exhaust system due to a failure. It can affect your car’s catalytic converter or spark plugs if it isn’t replaced.
  • defective spark plugs. Spark plugs are essential to the operation of your car’s engine. Your car’s performance and power will be considerably worse and diminished if you have damaged spark plugs or spark plug wires, and the engine may even be unable to start. If defective spark plugs are not replaced when necessary, further car problems may result.
  • Transmitter problems. To provide the wheels the power they need to go at a certain speed, the transmission of the car changes gears. You can notice vibrations and/or accelerating concerns if your car’s transmission isn’t working properly. When you suspect problems with the transmission, you should have it repaired right away because it is an expensive repair. This will guarantee your on-road security.
  • Dead or low battery. Your car’s battery is essential for starting it. Your car can start slowly or not at all if the battery is low or dead. It can be jump-started, but it’s wise to get a dead battery changed so you aren’t left stuck.

Call Now! (847) 265-5440

When the check engine light (also known as the malfunction indicator light or the service engine soon light) illuminates, one is almost usually overtaken by a feeling of dread. After all, your BMW looks to be functioning just fine. That is occasionally followed by bewilderment and denial. If the light turns off after some time of driving only to turn back on later, the sensation can be even worse. Since BMWs are among the world’s most dependable automobiles, whatever goes wrong is presumed to be significant.

Your check engine light is programmed to watch for problems with your BMW’s emissions system and to illuminate when it does. Even though the light indicates “check engine,” there could be a hundred various causes for the defect that is turning on the light. Some of these problems are very serious, while others are not. A loose gas cap is one of the most prevalent “not so serious” reasons of a check engine light. The system will identify the issue and turn on the light if you fill up your BMW but neglect to tighten the gas cap. O2 sensor problems, exhaust leaks, or even catalytic converter problems, among other, more significant problems, could exist.

It is advised to visit The Euro Shop’s ASE certified BMW servicing and repair specialists right away if your BMW’s check engine light does turn on. Your BMW is warning you that something is wrong and that continuing to drive could seriously harm the engine. The only way to properly understand what is happening within your BMW is to have it serviced by one of our knowledgeable BMW repair specialists. If your BMW check engine light is on, call us right away to set up an appointment for service. (847) 265-5440.

The top 5 causes for your BMW Check Engine Light to illuminate!

In BMWs, the check engine light is intended to alert you to a problem that needs fixing. Even though the problem may be very straightforward and simple to resolve, it is always important to be cautious and identify the precise root of the problem.

It’s always a good idea to see a BMW expert to make sure you aren’t endangering the health of your car by ignoring the issue.

How long can a BMW check engine light be on?

It is still possible to drive your car if the Check Engine light comes on for any reason, but it is only advised to go another 50 to 100 miles before checking your car’s computer for problem codes. You can pinpoint the problem at hand using this technique and deal with it however you see proper.

Depending on the problem that caused the Check Engine light to come on, you could be able to keep driving for a very long time or only a few days. The engine computer has time to reset some sensors after traveling between 50 and 100 miles, which could resolve the issue.

When the check engine light comes on, what should you check first?

1) Examine your gauges for any signs of low oil pressure or overheating in your car. Turn off your car if either of these problems is present to stop further harm.

2) Check the battery and charging system for damage. If the battery dies, your car will not start.

3) Inspect the fan, alternator, and serpentine belt. These parts are all essential to your car’s charging system. Regular oil changes should always include a belt inspection, which ABS Unlimited always performs.

Make sure there is a connection and that it is free of corrosion or wear by inspecting all cables to ensure that adequate connections are kept.

Maybe there’s no need for concern? Your check engine light will also come on if your gas cap is unsecured. Tighten the gas cap if you recently purchased gas. Try turning the car off, tightening the gas cap once more, and then turning it back on to see if the check engine light goes out right away. Resetting the sensor can occasionally take more than one attempt.

How can I tell if the check engine light on my car is serious?

Whether the check engine light is steady or flashing, its significance can change.

An issue has been discovered when the engine check light is both solid and flashing. But if your engine check light is flashing, there is a significant issue that needs your immediate attention. To avoid severe damage, it is best to call a professional as soon as you notice a flashing light.

When a situation is critical, the engine light may not blink in some automobiles. If an important problem has been found, red or orange will display in place of yellow on the light.

Bottom line: Whether the check engine light is solid or flashing, you should always have your car diagnosed and fixed. A flashing light signals an urgent situation that need immediate attention. Seek a mechanic’s assistance as soon as you can to protect your car and prevent expensive repairs.

What causes the check engine light to appear most frequently?

The oxygen sensor is the same way. This important component measures the amount of unburned oxygen present in your car’s exhaust, and if there is too little or too much, it may harm other engine components. Every time an oxygen sensor fails, a check engine light will come on. In fact, it’s among the most frequent causes of a check engine light appearing while you’re operating your car.

Is it legal to operate a BMW with the engine light on?

One of two things can happen when the check engine light turns on: it can either stay on or it can blink.

You can continue driving for a short while if your check engine light comes on but is not flashing, which indicates that the problem is probably not significant. However, it is advised that you schedule a certified BMW mechanic to examine your car as soon as possible.

The cause of the check engine light is almost certainly a major problem if it is flashing. You should safely pull over and have your car towed if it is performing poorly or making strange noises. Consider stopping if the check engine light is flashing but the rest of the car appears to be in working order. Speak with an expert auto shop to find out whether you can drive to a technician or if you need to have the car towed.

The check engine light should always be checked if it appears on your dashboard. Even little problems can develop into larger ones that cost you more money and cause more harm.

Why is my engine light on when there doesn’t seem to be a problem?

The on-board diagnostic system uses the “check engine” light to alert you of problems. However, that something might be any number of other things, great or tiny. It might turn on due to a minor issue, such as a gas cap that is loose or broken. It might also indicate a serious engine breakdown.

Who is able to diagnose the check engine light?

Reading the check engine light code that the car’s computer system provides is the first step. These are the details that your engine’s sensors have recorded. OBD II scanners or readers can read it using a connection (OBD port), which is often found under the steering column.

There are three ways to understand the code:

1. Pay a diagnostic fee and have your automobile serviced by a professional. If you agree to have the required service performed at that garage, the charge is frequently eliminated.

2. Take your vehicle to an auto parts store so the code may be read gratis. The benefit of the free check engine light analysis is that you might even be able to fix the problem yourself if the code turns out to be for a small issue.

3. Purchase a cheap scanner and decipher the code on your own. This is an especially wise choice if you drive an older vehicle that occasionally displays the check engine light due to minor issues. Scanners start at around $15, and some of them can wirelessly transmit data to your smartphone.

Will the check engine light automatically turn off?

If the problem that caused the check engine light to come on is fixed, the light will go out automatically. Consequently, if your converter is subpar and you frequently drive in stop-and-go traffic, which puts a lot of strain on the converter, it may have caused the check engine light to come on.