Mercedes C class Immobiliser bypass 

I had the red green red lights flashing in the mirror. I could crank but not start my petrol 1995 C220 W202. I thought it was an immobiliser issue. I finally found one comment on a Mercedes owners website- just one line that said "check your Over Voltage Protection (OVP) Relay". (relay in that silver box with the fuse next to OBD port). I did and that was it! That was my problem fixed! Easiest way to check the OVP is to remove the metal relay case and push the bottom relay with a plastic pen (with key in position 2) and you should hear the fuel pump and injectors come to life...and you can start your car. Order a new OVP relay (around $100) and you are good to go! I hope my post helps someone as this was a major, major issue for me and i hope I can save another W202 owner from all this heartache! I was about to junk my car and send it to the wreckers as no one - not even the MB Dealer could diagnose the fault!

Thx bro my w202 is back 🇨🇵

I think Mercedes original immo ( the other black box ) cuts the ground to the ignition coil. The aftermarket alarm does the same thing after the immo. They are connected in series to coil ground I think. When he remover the alarm and connects 2 green wires the alarm is bypassed but immobilizer still works. I will try to disable immo on my s600 after month. Wish me luck :D

Thank's a lot. it worked a treat

Can youhelp because my 99 c43 has the same issue No start motor not turning over . Key in ignition nothing happens only dash lights come on but I get a constant power to the yellow and pink or( light red) wire coming out of the back of the EIS

So I have the same car except left hand steering.. my question is, is that this can do no harm to the car even if the bypass procedure is done correctly and dosent work?

Hi.. I have 96 E320 with no ground to the fule pump relay inside the K40, can you help please?? Thank you

What's the name of that silverbox on the video.please help

Salut,Ieri dupa cumparaturi,am mers la masina sa o iau spre casa..dar cand ma bagat cheia in contact pur si simplu nu puteam roti cheia spre dreapta sa o pornesc..nu merge deloc..am ramas pe drum,un prieten m-a tractat pana acasa...bateria nu este ,ca am curent,merge radio,luminile,inchiderea..dar cheia nu vrea nici cum,,,daca imi bag cheia acum imi arata,,connecting data please wait,,si imi arata o cheia,ce crezi ca e?

Hi Guys... I have a W202 C220. I washed my key and now my immo does not want to disarm. I have the red and green LEDs flashing on. My review mirror and I have to lock and unlock manually. The car cracks but won't start. Who can I fix this.

How did you know exactly which cables to cut? I'm having the same problem with the same car.

Where do you find the black box on your left where you are suppose to cut the wires? Only found the silver box and black box on the right hand side.

Hi I found the black box where is the alarm box

This only applies to the early c class models, I've got a c270cdi from 2002 and under the footwell it is nothing like this, there is only a Siemens black box, not silver, therefore I still need to bypass the immobilizer and can't find anything about it.

Cum te pot contacta ?

salut! am avut si eu problema asta, dar a fost mai simplu sa scot siguranta. masina a ramas armata si nu mai pornea. am mers o saptamana fara siguranta de la centralizata, dar acum nu mai porneste deloc. ai vre-o idee? nu palpaie nici un bec, nimic.

Please Can I get thé bigin I have the problem

Am și eu aceasta problema la c250 1995 Am încercat aseară varianta ta dar nu funcționează plus ca nu are alarma a mea doar închidere, ce sfaturi mai poți da ? De o săptămână ma chinui sa o pornesc și nimic

I think what he did was to bypass the alarm module. Probably the alarm module failed and that's why the car wasn't starting. He did not bypassed the immobilizer so I think it still requires to unlock it before he can start it.

Hello man i have the exact problem create explanation!!! Them 4 wires that was cut connect the 2 boxes up aswell is that correct...? Purple/black-- and yellow/red

Buna. Spune si mie te rog ai pus ceva pe langa immo? Am acceasi problema. Nu stiu ce sa mai fac. Nu se mai aprinde la pornire ECU deloc.

will this work on a 1997 e320

will this work with 95 2.2d?

So after sliding down into a ditch avoiding a deer my 1997 Mercedes C230 won’t crank or start. I stick the key in and turn it and my horn starts beeping and I gotta immediately turn it back off. May it be a inertia reset switch or something of that nature? Man I’m at my wits end with this. Please help!

Ahoj poslal jsem ti email ale nemuzu te najít na FB... posli mi nejaky link... diky Dušan

I have a 1997 c230 base sedan, will this work?

We don't no this car bro

C what? 220? 230? 280?

I so hope people don't go and seemingly cut off wires without knowing what they are! This can only be a useless video as it doesn't explain why this worked

I'm also watching this since I don't like been held hostage for cunts over inflating prices just to start a engine of a vechile we already own