AdBlue (DEF) Counter Reset
This guide explains how to use the OBD module on a 2019–2026 Mercedes Sprinter with a 2.1L OM651, 3.0L OM642, or 2.0L OM654 diesel engine.
Package Contents
Your package may include:
- OBD module
- microSD card AdBlue Block Reset
The AdBlue Block Reset microSD card is already installed in the OBD module.
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.
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
-
Slow blink, about once per second
The module is working normally. Do not remove the module.
-
Rapid blink, about three times per second
The update is in progress. Do not remove the module.
-
2 blinks + pause
Incorrect or incompatible files on the microSD card. Remove the module and send us the LOGFILE.
-
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.
-
4 slow blinks
The module cannot read vehicle information. The ignition may be OFF, or the battery may be too weak.
-
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
- Do not remove the OBD module while the LED is blinking normally.
- Do not switch the ignition OFF during the procedure.
- Do not start the engine while the OBD module is installed.
-
The AdBlue / DEF Counter Reset does not repair the DEF system. It only resets the start countdown.
If the DEF system problem is not repaired, DEF / AdBlue errors may return immediately after the reset. A new start countdown may appear again after about 50 miles, and the vehicle may show a new 10 Starts Remaining message.
You can use the OBD module to reset the countdown again and keep the van drivable for some time. However, the original DEF system problem must still be diagnosed and repaired.
Installation Steps
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 about 30 seconds.
This allows the vehicle control modules to wake up fully.
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 2–4 minutes.
Remove the Module
When the LED stops blinking or turns off, the reset 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 the reset process 1–3 more times.
If the message still does not clear, send us the LOGFILE from the OBD module.
How to find and send the LOGFILE
Full Installation Video: How to install AdBlue (DEF) Counter Reset
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