How to Use KTAG to ReadWrite for Benz ME9.7 ECU

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How to Use KTAG to ReadWrite for Benz ME9.7 ECU

This article OBD2TOOL will show you a step-by-step guide on how to use KAG to read/write Mercedes Benz ME9.7.And try this procedures at your own risk!

Vehicle Information: Mercedes W221 S350
Device: KTAG ECU Programmer

Remove the ME9.7 ECU from vehicle,and open the ECU shell carefully.(for ECU shell removal,you can check this article:How to open EDC16 / EDC17 / MED17 )

ECU PCB show as picture show:


Step 2:
Connect then cable 14P600KT02 to the connector of ECU.

Refer to below pin out diagram:

Red color: Pin 15, 16: +12V

Black: Pin 2: GND


Apply solder paste on the red area in ECU as following picture:

Solder cable to ECU:


Note:Here i you want to make the procedures simplify,you can choose ME9.7 ECU Renew Cable.No need to disassemble the ECU and soldering cable connectors.It can reduce operational risk of ECU damaged.



Open KTAG software.

Then I Choose “Mercedes” “S (W221)” and “S350 3500 V6…BOSCH ME9.7”.


Choose plug-in “P102”.


I clicked “Read” and wait for a while.

Then Save the bin file.

Finally, i successfully used K-TAG Auto ECU Programmer to read Mercedes W221 ME9.7 ECU !


Then write procedures is same as reading procedures.And before you write a new ECU data file back into ECU,you would better make a backup.

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Ktag firmware 7.026 Reviews

Is Ktag 7.026 better than KTAG V7.020?
Is it worth buying a new tool just for this upgrade?

See how do people think of this?

Discussion at


This 7.026 update is all ready available from EU. “Problem ” is resetting. NXP need replace when time to reset tokens, after 30 writing. That can do few times if have good skills and good OBD II Scanner for this.


when you turn 1 job down you will think l should off upgraded , alot more gpt connections on newer ecu,s


7.026 is the one with 3 NXP mcu’s . everyone with 30 writings. i use it allow. all working ok and i think by the time i will use all 90 writings a new tool will come.


if you need Denso Nec NBD family the only tool doing this 100% is my 7.026. 7.020 will NOT MAKE DENSO NEC NBD even 15%. there may be 1 or 2 of the ecus it can do but that’s it. and no one aside from us can offer you 7.026 as its socketed solution. anyone who tells you 7.020 can make denso nec nbd 100% is just gonna take your money


I have ktag 7.026. Tool is OK.
Although it requires a good coffee machine… my reworked ktag 6.070 is MUCH faster


Ktag firmware 7.026 have MCU for change

Ktag firmware 7.020 not reset CFG


Ktag 7.026 TOKENS 30 in 1 MCU

Ktag 7.020 UNLIMITED


This ktag has some nice features like toyota denso or VAG GPT edc17c74


some EU seller claims that he has version without tokens limit.

Ktag 7.026 Russian clone has fixed firmware with token count stopped.
I use kess and ktag. No any headache. No heating to unlock, no nxp changing.
For KESS V2, As i know, for 5+ firmware, protocol files crypted individually for each original.
You can’t update different devices with same files.

Since Kess V2 4.036 a lot of protection added.
For ktag, i think, the same.
Take care before spend 2000+

In summary, there are good and bad reviews of Auto ECU Programmer ktag 7.026. Hint for you, do not rush into new versions. Time will tell you good or not. Before this, go for Ktag firmware 7.020.