SCR AdBlue / DEF Delete & PACKAGE DEAL
This guide explains how to use the OBD module on the 2009–2019 Mercedes-Benz ML- GL- GLK- E- GLE- GLS- classes with 2.1L OM651 and 3.0L OM642 engines.
Depending on your order, this instruction applies to:
- SCR AdBlue / DEF Delete
- PACKAGE DEAL
Before Starting
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Before using the OBD module, please read the full instructions from start to finish.
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Make sure the vehicle battery is fully charged.
If possible, start the engine and let it run for about 30 minutes before installation. This helps recharge and stabilize the battery.
Do not begin the software installation with a weak battery. A weak battery may interrupt the installation process and cause errors.
You can connect a battery charger to recharge the battery, but make sure to disconnect it before starting the software installation.
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Disconnect all aftermarket devices connected to the CAN bus, such as diagnostic tools, trackers, tuning modules, alarm systems, or other third-party electronic devices.
DEF / AdBlue Level
Before starting the installation, fill the DEF / AdBlue tank to 100%.
If the tank is around 70–90%, top it off to full.
Do not overfill the tank to the neck. Overfilling may cause the ultrasonic level sensor to read incorrectly.
Package Contents
Your package includes:
- OBD module
- microSD card already installed in the OBD module
All required installation files are already loaded on the microSD card.
During the installation process, you will see the available scripts on the screen:
- Step 1: Factory Update
- Step 2: AdBlue Block Reset
-
Step 3: NoSCR
or Stage1 + SemiDelete
or Stage1 + FullDelete
Use only the script required for your installation step.
The Step 1: Factory Update script should only be installed once, before running any other script for the first time. After the Update script has been installed, do not run it again unless we specifically instruct you to do so.
How to Turn the Ignition ON
Turn the ignition ON, but do not start the engine.
To turn the ignition ON:
- 1. Insert the key into the ignition.
- 2. Turn the key to the second position.
- 3. The dashboard warning lights should turn on.
Do not start the engine during the OBD module procedure.
Important Notes
- Make sure the battery is fully charged.
- Do not remove the OBD module while the LED is blinking normally.
- Do not switch the ignition OFF during the procedure.
- Make sure the microSD card is fully inserted into the module before starting.
- Make sure the correct microSD card is used for each step.
- Disconnect all aftermarket devices connected to the CAN bus before starting the installation.
- Do not install the Factory Update software before an emissions test or a dealer visit unless we specifically advise you to do so.
Installation Steps
This procedure uses all three steps:
- 1. Step 1: Factory Update
- 2. Step 2: AdBlue Block Reset
-
3. Step 3: NoSCR
or Stage1 + SemiDelete
or Stage1 + FullDelete
All three steps are located on the same microSD card already installed in the OBD module.
You must complete Step 1: Factory Update first.
Do not start Step 2 and Step 3 until Step 1 is completed successfully. Do not run Step 3 until the Remaining Starts / AdBlue block message is cleared.
Step 1 — Install the Update Software
On the radio screen, select the correct Step 2 script named: Step 1: Factory Update
Turn the Ignition ON
Turn the ignition ON, but do not start the engine.
Insert the key into the ignition and turn it to the second position.
The dashboard should turn on and all warning lights should appear.
Wait 30 Seconds
After turning the ignition ON, wait at least 30 seconds before plugging in the OBD module.
Plug in the OBD Module
Plug the OBD module into the OBD2 port.
Press the module firmly into the port to make sure it has good contact.
Select Step 1 on the Radio Screen
On the radio screen, select: Step 1: Factory Update
Use the radio buttons |<< and >>| to switch between the available steps.
Press * or + on the number pad to confirm your selection and start the process.
After selecting Step 1, watch the progress bar on the radio screen until it reaches 100%.
Follow the on-screen instructions during the process.
If the screen asks you to turn the ignition OFF or ON, follow the instructions exactly.
Do not remove the module while it’s downloading
The Update process usually takes 5–12 minutes.
Remove the Module
When the LED stops blinking or turns off, the installation is complete.
Remove the OBD module from the OBD2 port.
Step 2 — Reset the Engine Counter
On the radio screen, select the correct Step 2 script named: Step 2: AdBlue Block Reset
Turn the Ignition ON
Turn the ignition ON, but do not start the engine.
Insert the key into the ignition and turn it to the second position.
The dashboard should turn on and all warning lights should appear.
Wait 20 Seconds
After turning the ignition ON, wait about 20 seconds.
This allows the vehicle control modules to wake up fully before the reset begins.
Plug in the OBD Module
Plug the OBD module into the OBD2 port under the dashboard.
Press the module firmly into the port to make sure it has good contact.
Select Step 2 on the Radio Screen
On the radio screen, select: Step 2: AdBlue Block Reset
Use the radio buttons |<< and >>| to switch between the available steps.
Press * or + on the number pad to confirm your selection and start the process.
After selecting Step 2, watch the progress bar on the radio screen until it reaches 100%.
Follow the on-screen instructions during the process.
If the screen asks you to turn the ignition OFF or ON, follow the instructions exactly.
Do not remove the module while it’s downloading
The Reset process usually takes 2–5 minutes.
Remove the Module
When the LED stops blinking or turns off, the reset process is complete.
Remove the OBD module from the OBD2 port.
Start the Engine and Check the Dashboard
Start the engine and check if the Remaining Starts message has disappeared.
If the message is still displayed, repeat Step 2 Reset 1–3 more times.
If the message does not clear after several attempts, do not continue to Step 2.
Send us the LOGFILE from the OBD module.
How to find and send the LOGFILE
Step 3 — Install the Delete Software
After Step 2 is completed successfully, continue with the main software installation.
On the radio screen, select the correct Step 3 script for your order:
- Step 3: NoSCR
- Step 3: Stage1 + SemiDelete
- Step 3: Stage1 + FullDelete
Turn the Ignition ON
Turn the ignition ON, but do not start the engine.
Insert the key into the ignition and turn it to the second position.
The dashboard should turn on and all warning lights should appear.
Wait 30 Seconds
After turning the ignition ON, wait at least 30 seconds before plugging in the OBD module.
Plug in the OBD Module
Plug the OBD module into the OBD2 port.
Press the module firmly into the port to make sure it has good contact.
Select Step 3 on the Radio Screen
On the radio screen, select the correct Step 2 script for your order:
- Step 3: NoSCR
- Step 3: Stage1 + SemiDelete
- Step 3: Stage1 + FullDelete
Use the radio buttons |<< and >>| to switch between the available steps.
Press * or + on the number pad to confirm your selection and start the process.
After selecting Step 3, watch the progress bar on the radio screen until it reaches 100%.
Follow the on-screen instructions during the process.
If the screen asks you to turn the ignition OFF or ON, follow the instructions exactly.
Do not remove the OBD module during the installation process.
The Delete process usually takes 3–5 minutes.
Remove the Module
When the LED stops blinking or turns off, the installation is complete.
Remove the OBD module from the OBD2 port.
Start the Engine
Start the engine and check the dashboard.
The OBD module installation is now complete.
If the Check Engine light appears after installation, this may be related to the SCR control unit.
When to Send the LOGFILE
Send us the LOGFILE if the installation does not complete successfully.
If an error occurs, the radio screen will display a message:
Exception. Read the LOGFILE
When you see this message, stop the procedure and send us the LOGFILE from the microSD card.
You should also send us the LOGFILE if:
- The progress bar does not reach 100%
- The LED keeps blinking for too long (10+ mins)
- The Remaining Starts message does not clear after several reset attempts
You will need a computer and a microSD card reader to access the LOGFILE from the microSD card.
How to find and send the LOGFILE
Step 4 — Disconnect the SCR Control Unit
After the software installation is completed successfully, the original SCR control unit must be disconnected.
This step is required to prevent SCR / AdBlue-related warnings from coming back after installation.
The SCR control unit is located in the trunk under the floor..
Before starting, review the photo diagram and the photo of the SCR control unit location.
SCR control unit location for W166 ML250 ML350 Bluetec GLE250d GLE350d
SCR control unit under the floor
To disconnect the SCR control unit connector, use the black plastic locking lever on the connector.
Do not pull the wiring by force.
Carefully rotate the black plastic lever. As the lever moves, the connector will release and slide out from the SCR control unit.
Once the SCR control unit connector is disconnected, the installation is complete.
Start the engine and check the dashboard. The DEF / AdBlue warnings and Remaining Starts message should no longer be displayed.
SCR Control Unit Location for X166 GL350 Bluetec
SCR Control Unit Location for W212 E250 E350 Bluetec
Full Installation Video: How to install SCR AdBlue / DEF Delete & PACKAGE DEAL
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