chip inside the ews transponder key on bmw

EWS Deletion Chip

We have often been asked for an EWS delete chip. That is; a chip that boosts the horsepower of their 1995 325i and deletes the EWS protection at the same time.


About the EWS


EWS is an anti-theft system installed in BMW cars and it comes in different flavors (I, II, III, ETC.). Here we will refer to EWS-II specifically, which is installed in 1995 cars through 1998. Models later than 1998 use the EWS system too, but more advanced versions, like EWS-III.


Please note that this article focus on the Bosch 0 261 200 413 DME (ECU) and works only for the 1994 and 1995 325i E36. If you have a car earlier than 1994 or later than 1995 or if the ECU is not Bosch, but Siemens, this article will not apply.



The immobilizer unit in your BMW (EWS unit) manages the security system, taking care that the codes in your transponder car keys (coded RFID chip inside the key handle) matches the codes stored in the EWS unit itself. If it matches, it sends to the DME an OK signal to start the engine. Otherwise, the starter and the ignition will be disabled.


Block diagram of the EWS-II system in your 325i E36:


EWS-II system block diagram


Transponder key


chip inside the ews transponder key on bmw


One of the purposes of the EWS DELETE chips is disabling the security system, so the car can start and run with any key as long as it is mechanically cut to match the lock cylinder. The other purpose is to boost performance through reprogrammed fuel and ignition maps.


Our chip is similar to the chip in the video below, but more than 300% less expensive. It was meant for the non-EWS DME, so it has no EWS code inside. So if you use it in your EWS enabled 413 DME, it will disable the EWS, plus it will boost performance. For the chip to work properly, some simple wiring tampering to the EWS module must be done.

You may check some of this information in the video below from Mybimmerspace (My Bimmer Space) guy on his Youtube channel.



If you are installing a chip in this DME (ECM/ECU) model, below you can check the information about it:


Installing a Chip on the 1993-1995 BMW 325i/525i


By the way, if you happen to touch the battery with your DME chassis while it is still connected to the wiring harness, note that while the DME could be damaged by that, most of the times what gets damaged is the Airflow meter, as explained in the link below:


Engine problems after touching the battery terminal with the ecm of my 1994 BMW 325i


The Non-EWS DME computers always have a maroon colored label. The EWS Enabled DME’s, have a silver color label instead. That’s the only way to differentiate one from the other, as both have the same part number (“0 261 200 413”) and both are made by Bosch.


As you can check in the video above, the wires you will need to tamper are two wires for enabling the starter and one wire that sends a signal from the EWS module to the DME (wire #66 in the DME):


1. Cut the EWS wire coming from the EWS module (green in most cases). It is wired to pin #66 of the DME module. This will ensure no EWS signal to the DME.


Identifying wire #66


Location of pin #66 in BMW ecm


2. Cut wires #1 and #3 from the EWS module and join the part of the wires that go away from the module and cover with insulating tape or wire nuts. This will enable the starter.


Location of the EWS module:


EWS module location



The cons of this are of course, that your car will no longer be protected by the EWS system as long as you have this modification in place. The pros, (1) your car will have more power if using this chip, and (2) you won’t be stranded if the EWS system malfunctions, which is a situation that is more common than you think. Another pro is that you may have as many copies of your keys as you wish and will not have to spend (pricey) in programming services from the dealer.


Below are pictures for reaching the EWS Control Module, but you will obviously find it easier if you watch the video above.


How to reach the BMW EWS module - 2


How to reach the BMW EWS module - 1


Related Product


BMW 325i Power ROM performance chip



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  • Neftali Hernandez says:

    I have a question, if I buy one of those chips, will they work on my ews ecu if I cut the wire #7 at the ews module foe sure?

  • admin says:

    Welcome again Neftali. Yes, if you get one of those chips and your car is EWS equipped, all you will need to do is disconnect the wire #7 from you EWS-II module (or #66 from the ecu). That’s all and your car will be brought to life like magic with the chip installed.

    Thanks for reading,


  • admin says:

    Super quality 93-95 BMW 325i chip at:

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  • David says:

    I have 98 318ti with obd2… do I get around the ews no start problem

  • stanley says:

    please i have bmw x5 2004 the key got lost….what can i do to make the car start…

  • Michael says:

    Hello is there any way to disable the ews on a 1998 528i

  • Jason Williams says:

    2000 528I E39 w/#2 key and chip is damaged. The car wont start, Can i still follow the installation of the delete chip to get the car running again.

  • Guest says:

    Hello Jason. I regret I must say no.

    There are no replaceable chips in 2000 BMW models. They put replaceable EPROM chips only until 1995 models. For 1996 models and up, if not solving by getting the correct programmed keys, something like an EWS Emulator must be used, so normal keys can be used. If you use an EWS Emulator, you will still need a key cut for your ignition cilynder.

    For the EWS Emulator, you may search on eBay of just Google it. You will need to know what EWS version you have. I guess that for 2000 models, it is EWS3.


  • George says:

    Hi, My mother in-law owns a 1996 740iL and she was having some oil pan issues. We had a mechanic change the oil pan gasket. once he was done and all he lowered the vehicle back down. (he used a floor jack and jack stands) once he was all done we tried starting the car and it seems like there’s no power getting to the starter. I checked all fuses and relays. I been reading that this vehicles have some king of tilt sensors, and they have to be deactivated to avoid arming the alarm. Can you help me!!!!!!!!

  • terry says:

    whre can i find bmw e36 318i m43 ews module this model is made in south africa.

  • shane says:

    Terry did you find out where to get an e36 318i ews module , I have exactly the same problem and have no idea what to do , I’m not sure if a ews 1 red label dme will work in my car , I just need to get this car started and running again, please advise ….anyone

  • Brooks Honeycutt says:

    am in need of EWS CONTROL MODULE PART NO. 61358380423 FOR 95 BMW 525iT E-34


  • Scott Dean says:

    1997 BMW 328i nokeys they were stolen I need to bypass the ignition system and security system to get it to start

  • Scott Dean says:

    I need to bypass the ignition and security systems to get it to run the keys were stolen a long time ago what do I do ?

  • Murphy says:

    Hey there, I have the e34 540 1994-95 right hand drive, does it have the EWS unit & where is it located?
    Thanks Regards

  • Marc says:

    Hi I had a question about which wires on the ews is #1 and #3 that I need to join together

  • Jan says:

    I’ve got a question. Will it be possible in 318tds? I want to bypass ews2

  • Paul Martin says:

    I have a 2000 BMW 328i how do i bypass the ews

  • Collin says:

    This is exactly what I needed but I’m in a world of trouble. I was recently welding and my car caught fire melting the the box under the dash of my car that houses all the jumped wires in the main harness. The car is completely gutted and is now a track car. I will be wiring all the components necessary DeRon the engine on the fuse block etc. but how do I cut out the EMS and reinstall it into my custom harness so I can make the proper cuts mentioned in this article? Please help

  • zilog357 says:

    Hello Collin. I am sorry to know about what happened to your car.

    Do you want to cut the EWS and pass it over to a new harness (custom)?
    What year and model is your BMW?
    A wiring diagram will be very helpful. Do you need it? I might have it (free).


  • khaled says:

    Hi, I am stuck with E38 M73 no crank, but when i joing the two wires from EWS the relates to the starter the car cranks but does not start,
    I am wondering if I could bypass or delet the EWS from my car, 750 E38 V12.
    thanks in advance,

  • sello says:

    hala gys. can I bypass my e90 06 model ,wher is the ews for it , the and can I get coulor for wire 1 and 3 pls

  • Kabelo says:

    what kills the Key fob Transmitter receiver module.. it’s the third times replacing it for E36.

  • Thomas Phillips says:

    I have a 2000 BMW 323i e46 that has the EWS-III. I was trying to change the electronic component in my old key to a newer version, without understanding the importance of the transponder in the key, and somehow lost it. Thought I had went crazy at first but with some research I realized what I had done. Will the chip you sell work on this car and if not can you guide me on a “not” expensive way to remedy this. Thanks for reading all this.

  • zilog357 says:

    Hello Thomas. Unfortunately, the chip we sell will only work in the EWS-II system, specifically in the 0 261 200 413 Bosch DME computer. I am sorry I couldn’t help or give a different solution. I hope any of the readers can apport any solution.

    Kind regards,


  • willy says:

    Do you have an available EWS DELETE CHIP for 2005 BMW X5 e53 3.0i with M54 Engine

  • Marchi says:

    Hallo I have a 98 Z3 and I want to bypass the ews to start the car without to program a new key. My Question is, is the chip necessary or is it just for a performance propose and I can bypass the ews simple by following the wiring instructions in the article?

  • zilog357 says:

    Hello Marchi. Thank you for your question.

    The chip is needed, plus the wiring modification. If you cut and join the proper wires alone, the car will crank with any key that fits the cylinder lock, but will not start. The chip has a programming that ignores the EWS, but, I do not know about any chip for bypassing EWS on BMW models newer than 1995. What I have seen for those models is an EWS emulator to make the ECM “think” the correct key with the correct RFID chip is being used.

    Kind regards,


  • David says:

    Hi there,
    I have put a 97′ obd2 engine into a 92 obd1 e36 and won’t has a silver label dme will this chip fix any problems it is having or are my problems looking non ews related?

  • zilog357 says:

    Hello David.

    The silver labeled DME is the 1997 DME or the 1992 DME? Since I do not know the exact details of your case, I will cover the possibilities I can think of right now;

    1997 engines and 1992 engines have different sensors and probably different connections too. So this should only work if the case is one of the following two scenarios:

    1. You are using (a)the 1997 engine along with (b)the 1997 DME and included (c)the 1997 EWS module and (d)the 1997 ignition cylinder lock antenna and its amplifier.


    2. You are using the 1997 engine and the 1992 DME, making sure that all sensors and functions of the engine are matched to the functions and sensor inputs of the 1992 DME.

    Transplanting the 1997 engine and the 1997 DME, without also transplanting the complete EWS system of that model won’t work, unless you find a way of disabling the EWS in the DME.

    Unfortunately, the chip we sell won’t help because it fits only 1994-1995 325i E36 models and on top of that, 1997 DMEs do not have that chip in the circuit, as those use a different system.

    So if you do not have the EWS system of the engine donor, I guess that the easiest way would be to use the 1992 DME but again, make sure that all wires are matching the correct functions. You would need a wiring diagram of both cars to make 100% sure of that.

  • willy says:

    Is this EWS3 DELETE CHIP a plug in type or I will need to desolder the stock EWS enabled chip and
    solder the EWS delete chip to the ECU board as a replacement?

  • zilog357 says:

    Hello Willy. I am sorry, but the only chip that we have is the EWS-II, not EWS-III. For EWS-III and above, people are using an EWS emulator, as those DMEs do not have those EPROM chip types in the circuit. The EWS-III emulator is a small board that its wires (3) need to be soldered inside the DME and with a software they provide, a serial number is read and programmed in the emulator. From that moment on, the engine will start without the need of a transponder key.

  • Jorge says:

    Need bypass for 4 cyl. E36 1996 , m44 1996 ews ll , immobilizer connects pin 10 con ECU bosch 0 261 203 667 motroniç, please , help.

  • Dave Ausmus says:

    I’ve got a 1995 318TI with an m42. lost key. bypassing the EWS is no biggie. What DME can I put in it to run your chip?

  • Arie says:

    I have now a 316i from 94 and im gonna swap a 318is engine in it do i need to bypass a ews or does it even have a ews system?
    Can i buy a chip for the dme from the m42

  • SandraShown says:

    You did great job man i like and appreciate you

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