If you own a 2015 Mercedes Sprinter, you are likely familiar with the frustrations that can come with the Selective Catalytic Reduction (SCR) system.
While the system is designed to reduce emissions, faults in the AdBlue injection, NOx sensors, or heating elements can lead to dreaded warning lights, reduced engine power, and even limp mode.
For many owners and fleet managers, installing an AdBlue Emulator is the most effective solution to bypass these complex issues.
At obd2.ltd, we provide high-quality plug-and-play solutions to help you get your vehicle back on the road without the hassle of expensive dealership diagnostics.
A question we get asked frequently by Mercedes Sprinter owners is: “I have the emulator, but which fuses do l need to remove?”
Based on the fuse layout for the 2015 Mercedes Sprinter and standard installation procedures for Mercedes-Benz trucks, this guide will walk you through the exact fuses to pull to ensure your new AdBlue OBD2 Emulator works flawlessly .
Understanding the AdBlue System in the 2015 Sprinter
Before we start pulling fuses, it helps to understand what we are dealing with. The 2015 Mercedes Sprinter is equipped with a Diesel Exhaust After treatment system to meet Euro 5/6 emissions standards. This system relies on several key components:
- The SCR Control Relay: Manages the overall function of the exhaust treatment.
AdBlue Heating Systems: Multiple heating circuits prevent the AdBlue fluid from freezing in cold temperatures.
The Control Unit: Monitors fluid levels, dosage, and sensor readings.
When this system fails, it often results in warning messages regarding “AdBlue See Owner’s Manual” or countdown limiters. An emulator works by overriding the AdBlue system, effectively stopping the usage of the fluid and disabling the NOx sensors to keep the engine management system happy without actually requiring the physical components to work .
Why Remove Fuses During Installation?
According to product specifications for AdBlue OBD2 Emulators designed for Mercedes-Benz trucks, a critical step in the installation process is isolating the vehicle’s original control modules .
The instructions typically state: “Remove the fuses mentioned.” . This is done for two reasons:
1.To Cut Power to Factory Components: Removing specific fuses ensures that the factory SCR control relay and AdBlue heating systems are completely disabled. This prevents any voltage feedback or conflict between the original ECU and the new emulator.
2.To Prevent Error Codes: If the heating systems are left active while the emulator is tricking the NOx sensors, the vehicle might still detect an anomaly and throw a fault light. Pulling the fuses ensures a clean slate.
2015 Mercedes Sprinter: Fuse Box Location and Layout
For the 2015 model year Sprinter, the primary fuse box is typically located in the dashboard, on the driver’s side (left-hand drive models) behind a protective cover. You may also find relevant fuses in the pre-fuse box in the engine compartment, but for the SCR system, the dashboard box is the primary target emulator to take over control of the AdBlue simulation without interference from the factory relay, Fuse #32 must be removed.
This aligns with the standard Mercedes truck procedure where removing the main SCR fuse allows the aftermarket AdBlue OBD2 emulator to communicate directly with the vehicle’s network without the factory module waking up and causing a conflict .
The Secondary Fuses: #34, #35, #36 (Heating Systems)
These fuses control the heating elements for the AdBlue tank and lines. Whether you need to remove these depends on your specific vehicle setup and climate, but here is the general rule of thumb:
lf you live in a cold climate: The heater circuits will try to activate automatically in low temperatures. If these fuses remain in place while the emulator is installed, the system might still try to draw power, potentially logging a fault for an “open circuit” or “heater malfunction.” It is often safer to remove them.
lf you want a complete bypass: To ensure the aftertreatment system is 100% disabled without any side effects, it is recommended to remove Fuses #34, #35, and #36 as well.
Summary of Removal:
For a complete and error-free installation on a 2015 Mercedes Sprinter, you should remove Fuse #32, #34, #35, and #36.
The Complete Installation Procedure
Following the industry-standard procedure for Mercedes-Benz vehicles, here is the full workflow to get your AdBlue Emulator running :
- Safety First: Ensure the vehicle is completely off. Pull the key out from the ignition and wait for all dashboard lights to go out .
- Access the Fuse Box: Open the driver’s side dashboard fuse panel.
- Remove the Fuses: Using a fuse puller or needle-nose pliers, carefully remove Fuses #32, #34, #35, and #36. Store them in a safe place in case you ever need to revert the vehicle to its original factory settings.
- Locate the OBD2 Port:The OBD2 diagnostic port is typically located under the dashboard on the driver’s side, near the steering column.
- Plug in the Emulator:Take your AdBlue OBD2 Emulator from Cartooldeal.com and firmly plug it into the OBD2 connector . It is designed to fit the specific pin layout of Mercedes-Benz vehicles.
- Test the System: Turn on the ignition (do not start the engine yet). Observe the instrument cluster.
Benefits of Using the AdBlue Emulator
Once you have successfully removed the correct fuses and installed the emulator, you can expect the following benefits :
No More AdBlue Top-Ups: The system is overridden, so you no longer need to purchase expensive AdBlue fluid.
No Power Loss:The emulator ensures the engine ECU does not derate power, so you maintain full performance .
Dashboard Warnings Gone: lt stops the “Check AdBlue” warnings and countdown limiters .
Non-Damaging: This is a plug-and-play device. It does not damage the engine or permanently alter the factory ECU settings .
Reversible: If you ever need to return to stock for servicing or resale, simply unplug the emulator and replace the fuses .
FAQ – Mercedes Sprinter AdBlue Emulator
Q1: Which fuses should I remove when installing the AdBlue Emulator on a 2015 Mercedes Sprinter?
A: Remove Fuse #32 (SCR Control Relay) and the secondary heating system fuses #34, #35, and #36 for a complete and error-free installation.
Q2: Do I need to unplug the vehicle from power before removing fuses?
A: Yes. Ensure the vehicle is completely off, remove the key, and wait for all dashboard lights to go out before removing any fuses.
Q3: Will removing the heating system fuses affect the vehicle?
A: Removing fuses #34, #35, and #36 disables the AdBlue heating circuits. This is recommended if you want a full bypass or if you live in a cold climate to prevent errors while using the emulator.
Q4: Can the installation be reversed?
A: Yes. The emulator is plug-and-play. To revert, simply unplug the device and replace the removed fuses.
Q5: Will installing the emulator damage my engine or ECU?
A: No. The emulator is designed to safely override the AdBlue system without altering factory ECU settings or damaging the engine.