Your BMW X4 doesn’t start anymore and you understand it’s because of your immobilizer but you don’t know exactly how it works or how to find it? We will try to provide you with an answer in this article.
First, we will explain what this famous immobilizer is for and just how it works on your BMW X4.


Anti-start utility on your BMW X4:

This one is of course used as an anti-theft protection. Indeed, it is programmed to be able to start your BMW X4 only if the key containing this code is inserted. We remember these films where thieves adjust a few wires under the dashboard to start the engine, which is impossible with the anti-start system.

Anti-start operation on your BMW X4:

To put it simply, we have a transmitter and a receiver that function together to validate the operation and consequently switch on the engine. The immobilizer includes the transmitter, and will therefore issue a code request when the key is inserted in your BMW X4. Think of this transmitter as a doorkeeper who would ask for an entry 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 if this code matches, then the anti-start will allow the engine start.
The operation is very simple. However, when mentionning double safety, we also suggest potentially more possibilities of breakdowns or various failures unfortunately.
In the next paragraph, you will find the various breakdowns you could deal with on your BMW X4.

Immobilizer failures:

There may be various factors that prevent your BMW X4 from starting because of the immobilizer. First of all, incredibly, 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, consequently the immobilizer. In such a case, it is easy to detect if you have a duplicate key. If, with the two keys of your BMW X4, you have the same difficulty, then it is the anti-start that is defective and therefore must be replaced or disabled. Doing so will cost less than replacing it, but your car will be more subjected to to theft and your insurance may not cover you if your car is stolen.
  • Option n2: The difficulty comes from the receiver, the key, which transponder has been damaged. 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 X4 and charge a high price for everything, he will not give you the code easily. For security reasons alone, it is legally impossible to send out the code to you. You must send your car.


  • – First try to find where the failure on your BMW X4 came from. Then act accordingly. It would be a pity to change 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 tutorials on the BMW X4, go to our BMW X4 category.