The electronic immobilizer prevents unwanted starting and driving away. Virtually every car manufactured since around 1990 is equipped with an immobilizer. The international term for immobilizer is immo or immobilizer.
In the case of BMW, Mini and Rolls Royce, this immobiliser is located in the EWS, CAS, FEM or BDC module.
There are many legitimate reasons why you might want to deregister the immobiliser, for example for an engine swap (m50 / m52 / s50 / s54) in an E30 or E36.
Which ECUs does this apply to?
With many old and recent ECUs it is possible to write away the immobiliser.
The electronic immobilizer prevents you from starting and driving away if the car doesn’t recognize the chip in the key. This immobilizer is integrated into the EWS/CAS module.
There are many legitimate reasons why you might want to deregister the EWS (immobilizer). For example, with an E36/E46 engine swap in an E30 BMW.
It is possible to write away this start block.
Possible for all types of ECU from BMW and Mini.
Applicable to
ECU:
- ME5.2 / ME 5.2 (1432763 / Bosch 0261203667)
- M5.2.1
- ME7.2 / ME 7.2
- MS41 / MS41.1 (5WK90353)
- MS42 (7500255 / 5WK9037)
- MS43 (7525355)
- MS45
- MSS50
- MSS52
- MSS54
- MSS54HP
- MSS54HPCSL
- MSS60
- MSS65
- MSS70
- MSV70
- And more
Model generations:
- E30
- E36
- E46
- E39
- E53
- E85
- E81 / E82 / E87 / E88 / E89 / E90 / E91 / E92 / E93
- And more
Motorcodes:
- M50
- M52
- M54
- S50
- S52
- S54
- S65
- S85
- M42
- M43
- M44
- M62
Is your ECU not listed? Send a message via the contact page!
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What our customers say
Great service, even with urgency it was very fast, it could be fixed the same day, I am very happy with it, definitely recommended!!
Highly recommended to bring your BMW in if you need software updates or programming done! This guy knows what he's talking about and is willing to go the extra mile to make sure you go home satisfied! Thanks for the experience. Regards, Dennis (speeddonors)
Very satisfied with Carware! My dashboard lights stopped working, and owner Jan quickly found the cause. He honestly suggested I could fix it myself to save money—and he was absolutely right. Friendly service (even offered a drink) and very knowledgeable. Absolutely recommended! You won't find service like this again! 5/5 ⭐️
Very satisfied with the work and the service. He keeps his appointments and delivers quality work. Jan is also a true specialist/expert and works very neatly. Highly recommended.
After replacing several parts on my BMW M140 with no success, the ECU turned out to be the culprit. After some online research, I found Hagenaar Carware, where I received excellent service. Jan quickly diagnosed the problem correctly. He clearly explained the problem and the costs. Clear communication, no surprises, and expert service. Highly recommended for anyone with electronic problems with their BMW or MINI.
My car has been parked since July 7th due to a malfunction in the electronic steering lock on my BMW E90.
Last year, the entire steering column was replaced, but after a few months, the same problem arose. No one could solve it, but after a long search online, I found Jan, and after a clear explanation and a potential solution, I regained hope.
Jan remotely—how?—really got my car running again and immediately wrote down all the malfunctions and error messages.
Jan is a hero! It's a shame you can only give 5 stars and not 10, otherwise he would have definitely earned them!
Last year, the entire steering column was replaced, but after a few months, the same problem arose. No one could solve it, but after a long search online, I found Jan, and after a clear explanation and a potential solution, I regained hope.
Jan remotely—how?—really got my car running again and immediately wrote down all the malfunctions and error messages.
Jan is a hero! It's a shame you can only give 5 stars and not 10, otherwise he would have definitely earned them!
I had a problem with the ROC module for my BMW. Jan neatly fixed all the error codes and reinstalled the module. A fantastic solution, instead of having a new and expensive module replaced at the garage. Jan communicates quickly and honestly about the options and any risks. He also provides immediate clarity about the costs. In short, I understand why all the reviews here are 5 stars, and this one adds another 5 stars!
Response from the owner 06:46 01 Sep 25
Jos, dank voor je leuke review en je lovende woorden. Daar doen we het voor! 🙂
The ECM of a 320 convertible was repaired and updated with new software. The car now drives smoothly and better than ever. Excellent service! Perfect! Highly recommended!
Response from the owner 06:46 01 Sep 25
Dank voor je lovende woorden!
I have an old BMW Z3, and after winter storage, it wouldn't start.
Jan was able to come on-site within two days to scan the Z3, but unfortunately, that wasn't possible because the Z3 has an older system.
Luckily, Jan still had an old laptop with the correct software.
He quickly realized the AWS module was malfunctioning. He gave me tips on how to work around this and adjusted the ECU. And yes, it's running like a charm again.
Excellent, clear communication, good advice.
Simply a true professional.
We need more of them.
Jan was able to come on-site within two days to scan the Z3, but unfortunately, that wasn't possible because the Z3 has an older system.
Luckily, Jan still had an old laptop with the correct software.
He quickly realized the AWS module was malfunctioning. He gave me tips on how to work around this and adjusted the ECU. And yes, it's running like a charm again.
Excellent, clear communication, good advice.
Simply a true professional.
We need more of them.
Response from the owner 06:47 01 Sep 25
Joost, dank voor je leuke review. En veel rijplezier toegewenst in je Z3!
My frame broke.
He expertly repaired it for me.
Great service.
I was able to get an appointment within two hours and it was fixed within half an hour. Absolutely fantastic.
Highly recommended 👌👌
He expertly repaired it for me.
Great service.
I was able to get an appointment within two hours and it was fixed within half an hour. Absolutely fantastic.
Highly recommended 👌👌
Response from the owner 09:57 28 Jul 25
Dankjewel Cristian voor je review. En fijn dat je FRM het weer helemaal doet
We had Jan install original BMW cruise control in our BMW Z4. Everything was expertly installed and thoroughly tested. Jan works calmly and consistently. Highly recommended!
Response from the owner 09:58 28 Jul 25
Ha Johan,Fijn dat je blij bent met de originele cruise control. Origineel blijft in onze ogen de mooiste oplossing voor je Z4.Hartelijke groet,Carware
After some online research, I found Hagenaar Carware for an upgrade to the DCT gearbox in my BMW E92 M3, specifically the GTS software. After contacting them through the app, I was able to quickly schedule an appointment.
Once I arrived, Jan already heard me 🥳. He immediately grabbed the laptop to check everything for error codes, after which the software could be installed. Meanwhile, Jan changed my menu to Dutch (it was in English), completely free of charge 👌
After an hour, we were back on the road, and the shifting was so incredibly fast.
Thanks, Jan!
Once I arrived, Jan already heard me 🥳. He immediately grabbed the laptop to check everything for error codes, after which the software could be installed. Meanwhile, Jan changed my menu to Dutch (it was in English), completely free of charge 👌
After an hour, we were back on the road, and the shifting was so incredibly fast.
Thanks, Jan!
Response from the owner 09:59 28 Jul 25
Ha Piet,Het werken aan een E92 M3 is altijd extra leuk. Fijn dat je tevreden bent, en het mooie V8-geluid was inderdaad al van ver te herkennen ;-)Hartelijke groet,Carware
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