Your BMW X3 doesn’t start anymore and you know it’s because of your immobilizer but you don’t know particularly how it works or how to find it? We will try to provide you with an answer in this article.
First of all, we will describe what this famous immobilizer is for and just how it works on your BMW X3.


Anti-start utility on your BMW X3:

This tool is of course used as an anti-theft protection. Indeed, it is programmed to be able to start your BMW X3 exclusively if the key that has this code is inserted. We keep in mind these movies where thieves operate a few wires under the dashboard to start the engine, which is impossible with the anti-start system.

Anti-start operation on your BMW X3:

To put it simply, we have a transmitter and a receiver that work together to validate the operation and consequently switch on the engine. The immobilizer has the transmitter, and will consequently issue a code request when the key is inserted in your BMW X3. Imagine this transmitter as a doorkeeper who would ask for an a way in code when someone knocked at the door.
This code request is provided to the key, which subsequently, sends a unique user code, specific to the start system, and in the event this code matches, then the anti-start will allow the engine start.
The procedure is very simple. However, when mentionning double safety, we also suggest potentially more chances of breakdowns or various failures unfortunately.
In the next paragraph, you will find the various breakdowns you could deal with on your BMW X3.

Immobilizer failures:

There may be various motives that prevent your BMW X3 from starting because of the immobilizer. First of all, stupidly, you’re not using the right key. It may seem not important but it happens!
If you have the right key, you have two options left:

  • Option n1: The transmitter is involved, so the immobilizer. Usually, it is easy to establish if you have a duplicate key. If, with the two keys of your BMW X3, you have the same problem, then it is the anti-start that is flawed and therefore must be replaced or disabled. Completing this task will cost less than replacing it, but your car will be more exposed to theft and your insurance may not cover you if your car is stolen.
  • Option n2: The problem comes from the receiver, the key, which transponder has been harmed. This can be changed for less money by a professional than the anti-start system.

If you contact your mechanic, he will obviously offer to tow your BMW X3 and charge a high price for everything, he will not give you the code quite readily. For security reasons alone, it is legally impossible to transmit the code to you. You must send your car.


  • – First try to determine where the failure on your BMW X3 came from. Then act accordingly. It would be a pity to replace the entire immobilizer system when the key is defective.
  • – Make a quote at a garage and then consider an alternative at an online professional, which will often be more efficient and less expensive.

If you need more guides on the BMW X3, go to our BMW X3 category.