SCR AdBlue / DEF Delete & PACKAGE DEAL
This guide explains how to use the OBD module on a 2019–2022 Mercedes Sprinter with 2.1L OM651 or 3.0L OM642 engines.
Depending on your order, this instruction applies to:
- SCR AdBlue / DEF Delete
- PACKAGE DEAL
Please follow the steps carefully and use the correct microSD card sequence.
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 may include:
- OBD module
- microSD card Reset (Step 1)
- microSD card marked Delete, NoSCR, S1FULL, or S1SEMI (Step 2)
- microSD card marked Factory
The Reset microSD card is usually already installed in the OBD module.
The Factory microSD card should only be used if we instruct you to restart the installation from the beginning. Do not use the Factory card unless we specifically advise you to do so.
Do not mix up the microSD cards. After using each card, return it to its plastic bag.
How to Turn the Ignition ON
Turn the ignition ON, but do not start the engine.
To turn the ignition ON:
- 1. Make sure your foot is not on the brake pedal.
- 2. Press the Start/Stop button two times.
- 3. The dashboard should turn on completely.
Do not start the engine during the OBD module procedure unless the instruction specifically tells you to start it.
OBD Module LED Indicator
The OBD module has a small LED indicator.
After plugging the module into the OBD2 port, the LED will turn on and start blinking.
You must watch the LED during the procedure.
Do not remove the module while the LED is blinking normally.
LED Status Meaning
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Slow blink, about once per second
The module is working normally. Do not remove the module.
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Rapid blink, about three times per second
The update is in progress. Do not remove the module.
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2 blinks + pause
Incorrect or incompatible files on the microSD card. Remove the module and send us the LOGFILE.
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3 blinks + pause
The microSD card is not detected. Remove the module, check that the microSD card is fully inserted, or send us the LOGFILE.
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4 slow blinks
The module cannot read vehicle information. The ignition may be OFF, or the battery may be too weak.
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LED stops blinking / turns off
The process is complete. Remove the module and continue with the next step.
How to find and send the LOGFILE
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 software before an emissions test or a dealer visit unless we specifically advise you to do so.
Installation Steps
This procedure uses two software steps:
- Step 1: Reset
- Step 2: NoSCR / S1FULL / S1SEMI
You must complete Step 1 first. Do not start Step 2 until Step 1 is completed successfully and the Remaining Starts / AdBlue block message is cleared.
Step 1 — Reset the Engine Counter
Use the microSD card marked Reset.
This card is usually already installed in the OBD module.
Turn the Ignition ON
Turn the ignition ON, but do not start the engine.
Press the Start/Stop button two times without pressing the brake pedal. The dashboard should turn on completely.
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.
Watch the LED
Watch the LED on the OBD module.
The module is working while the LED is blinking normally. Do not remove the module during this process.
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 1 — 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 2 — Install the Delete Software
Use the second Delete microSD card may marked:
Replace the microSD Card
Remove the Step 1: Reset microSD card from the OBD module.
Insert the second microSD card marked NoSCR, S1FULL, or S1SEMI.
Make sure the microSD card is fully inserted.
Turn the Ignition ON
Turn the ignition ON, but do not start the engine.
Press the Start/Stop button two times without pressing the brake pedal. The dashboard should turn on completely.
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.
Watch the LED
Watch the LED on the OBD module.
Do not remove the module while the LED is blinking normally.
The software installation 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 LED shows 2 blinks + pause.
- The LED shows 3 blinks + pause.
- The LED keeps blinking for too long (10+ minutes) and does not complete.
- 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 3 — 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.
Some plastic trim needs to be removed to access the SCR control unit connector. Do not force any plastic parts, clips, or connectors.
Please watch the separate video instruction before starting this step.
How to Disconnect the SCR 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.
Full Installation Video: How to install SCR AdBlue / DEF Delete & PACKAGE DEAL
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