Monthly Archives: June 2018

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How to Find and Write VAG 7th Byte CS with Tango Key Programmer

Find out and write VAG 7th Byte CS requires Tango software version 1.112 or above.  Tango Key Programmer software updated to V1.112 on May 9th, 2018.

Tango transponder programmer software added (online update)

1-Added new transponder MEGAMOS AES
2-Toyota key maker: new menu item AUTODETECT
3-Key maker Kia Sportage 2008- (MPC5xx,HITAG)
4-Key maker Hyundai Sorento 2008- (MPC5xx,HITAG)
5-Key maker Renault Fluence III 2012- (NEC850,HITAG)*
6-Key maker Renault Megane III 2012- (NEC850,HITAG)*
7-Fixed some bugs, incl. PCF7930-35 recognition

How to find VAG CS 7th Byte in Tango?

requires Tango software version 1.112

Component Security in keys of the Megamos48 type
The modern immobilizers of the VAG-group vehicles have such conception as “Component
Security” (CS). The CS is an array of 7 bytes length. Its role in a vehicle is to forbid a mixing of
electronic units from different cars. In terms of the immobilizer the CS is a “password” that used
in couple of the Motor Unit (ECU) and the immobilizer.
The protection scheme includes 3 components that share the CS, they are:
The protection scheme allows the engine to start only in case when the CS is identical in all the
three components.
Key and CS
The CS is a part of the Crypto Key and fills its upper area Word9-Word6.

In common practice it is possible to get the first 6 bytes of CS. The last, 7th byte is unknown.
There are many ways how to find out the 7th byte. One of them is to pull out it from an existing
key. Thus, to use this tool, it is needed to have at least one valid key.
1. Running of the “Search Component Tool”
Click the appropriate button in the MEGAMOS-48 mode as shown on the picture:


2. In the new window:
Type the 6 bytes of CS that are known
Select Brand
Select method


At this example the CS assumed as A8CE3566AEBC and a car is Seat.
3. Now all is ready to start searching.
Put the valid existing key into the programmer coil.
Click the “Start Searching” button:


During operation the 7th Byte value will change sequently from 0x00 to 0xFF. When the value is
valid, the process will be stopped. Operation takes up to 1 min of time.

How to Write CS 7 Bytes with Key Programmer Tango?

Key and CS
The CS is a part of the Crypto Key and fills its upper area Word9-Word6.
ECU and CS
ECU uses the CS as a password. More modern ECUs contain only 6 bytes of the CS. In this case
the CS should be extracted from another devices, for example it may be a dashboard.
The vehicle dashboard usually has a role of an immobilizer. The IMMO always contains all the 7
bytes of the CS.

The tool “Write Component Security 7 Bytes” (Megamos 48 window) helps you to put the CS
manually into a transponder. Let’s see an example of ECU BOSCH Motronic M7.


The CS has been marked in the blue color.
To write the CS, invoke the tool and type the CS in the window:


Select the vehicle brand and press the Write button. Temporary the Seat brand is unavailable.

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FAQ of MB SD C4 Functions, System Requirement and Activation

As a hot sale product in, MB SD C4 leads a heated discuss and consult. And now, we have collected some frequent asked questions about MB SD Connect C4 and sort them in functions, computer system and activation.

MB SD C4 Functions FAQ
Q: Does SD Connect 4 support SCN coding?
A: Yes,SD Connect 4 support SCN coding,but you should get the account yourself.

Q:MB SD C4 could read chassis number for Smart 1998, but unable to test ECU after connected with the car.
A: It needs login password when test Smart, we have DAS SMART Calculator to help calculate login password.

Q: Can Star Diagnoses SD C4 diagnose ML 270 2005 and A class W169 2007?
A: Yes, C4 could diagnose ML 270 2005 and A class W169 2007.

Q: Can SD C4 diagnose Mercedes Benz Trucks, 3335, 1823 and 1413?
A: Yes, C4 could diagnose Benz Trucks, 3335, 1823 and 1413.

Q: Can SD C4 diagnose and program for Mercedes Benz BUS body.
A: Yes, C4 could diagnose MB Bus body.

Q: Does MB SD C4 support W205, w222 and w906?
A: Yes, MB SD C4 can support w205, w222 and W906.

Q: Where to find Smart TAN CODE in the software of SD Connect 4?
A: Sorry, so far we have no Smart TAN code, advice you go to 4S store or original factory to consult.

MB SD C4 Computer system requirement FAQ
Q: Does SD Connect 4 contain SATA HDD?
A: There are three kinds of hard disk formats for SD Connect 4 , including: for Dell D630, for T30 and moveable hard disk, and only two kinds of format for SD C4 , including: for Dell D630and moveable hard disk. Do they contain SATA HDD? It depends on which kinds of HDD, please write a note which format you need when ordering.

Q:  Is MB Star C4 compatible with window7?
A: moveable hard disk version is compatible with WIN7, better Professional version. But suggest you not use WIN7, 90% sdc4 software get broken because of the usage of WIN7.

Q: I have blue screen after insert SD C4 Dell D60 hard disk into the computer and open it.
A: make sure your Dell D630 computer is integrated video card and with 1GB memory, because the D630 of discrete video card is easy to have blue screen or shutdown and restart, restart and shutdown.

Q: When I click “Diagnostic” to find “Fingerprint ID” of SD Connect 4, I got an error” Internal error (3.17)- 3.89 You must contact the user help Desk “.
A: Check whether your computer is compatible with latest xentry software. If you choose d630 hard disk, it needs to work with Dell D630 computer with integrated video card and 1GB memory; if you choose movable hard disk, it’s requirement to the computer is: CPU 2.0GHZ or above, 2GB memory or more, Windows XP professional.

MB SD C4 Activation FAQ
Q: when I setup SD connect compact 4 hard disk; I got a message reading “No access authorization code! Please contact the Star diagnosis call center”.
A: It needs activation, please send us Hardware fingerprint, LAN-ID and HW-ID, then we will help you active. As for how to get Hardware fingerprint, LAN-ID and HW-ID,

Q: When I open EPC of MSD Connect 4, I got error message “unable to start application program”, what’s the reason?
A: Firstly, make sure EPC is activated. Secondly, make sure enter EPC from “EPC NET EXPLORER ” and find out LAN ID, finally active it. (A part of users tend to directly start EPC from Xentry, this is not correct.) Still have got the same error? Please contact us for remote assistance.

Q: After I get MB SD connect c4 activation file, I have no idea how to use it, active by star utilities or by EWA NET?
A: We have video tutorial, please click column “Video” to watch. Important note: make sure enter EPC from “EPC NET EXPLORER” and find out LAN ID, finally active it.

Q: I insert the DELL D630 hard disk of MB STAR compact C4 into the computer and then turn on the computer; it asked me for administrator code, what is this code?
A: This administrator code is: User$star2004