Your Ford Focus 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 Ford Focus.find-anti-start-code-ford-focus

Anti-start utility on your Ford Focus:

This tool is of course used as an anti-theft protection. Indeed, it is programmed to be able to start your Ford Focus only if the key that has this code is inserted. We remember these films where thieves adjust a few wires under the dashboard to start the engine, which is out of the question with the anti-start system.

Anti-start operation on your Ford Focus:

To put it simply, we have a transmitter and a receiver that function together to validate the operation and thus switch on the engine. The immobilizer provides the transmitter, and will therefore issue a code request when the key is inserted in your Ford Focus. Imagine this transmitter as a doorkeeper who would ask for an entry code when someone knocked at the door.
This code request is directed to the key, which in turn, 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 mean 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 Ford Focus.

Immobilizer failures:

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

  • Option n1: The transmitter is involved, consequently the immobilizer. Usually, it is easy to detect if you have a duplicate key. If, with the two keys of your Ford Focus, you have the same problem, then it is the anti-start that is flawed 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 problem comes from the receiver, the key, which transponder has been harmed. This can be replaced for less money by a professional than the anti-start system.

If you contact your mechanic, he will obviously offer to tow your Ford Focus 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 identify where the failure on your Ford Focus came from. Then act accordingly. It would be a shame 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.

To get more tips on the Ford Focus, take a look at the Ford Focus category.