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Why is my engine light on BMW 3 series all the time as it has just had a service and work done brakes?

It's impossible to say for sure why your BMW 3 series engine light is on without more information. However, here are some of the most likely reasons:

Reasons why the engine light might be on after a service:

* Loose or disconnected connection: During the service, a technician may have accidentally disconnected or loosened a sensor wire. This can cause the engine light to illuminate.

* New code needs to be cleared: The service might have triggered a new diagnostic code. Sometimes, the light stays on even after the issue is fixed, and it needs to be manually cleared by a mechanic using a code reader.

* Issues with the service itself: The service may not have been done correctly, and the engine light is indicating a problem related to the work performed. This could be anything from a faulty part to an incomplete job.

* Unrelated issue: Even though the service was performed, the engine light could be illuminating due to an unrelated problem.

Reasons why the engine light might be on after brake work:

* ABS sensor issue: Brake work could have affected the ABS sensors, leading to a code being thrown.

* Brake fluid level: The brake fluid level sensor might be malfunctioning or the fluid level is low.

What you should do:

1. Check the owner's manual: Your manual might have a section explaining the engine light and possible causes.

2. Use a code reader: If you have one, you can use it to read the diagnostic code. This can provide clues about the problem.

3. Visit your mechanic: The best solution is to take your car to a qualified mechanic. They can diagnose the issue and provide the necessary repairs.

Important Note: Driving with an engine light on can lead to further damage and should be addressed as soon as possible. Don't ignore it.