The Mercedes-Benz Sprinter van is renowned for its robust construction, spacious cargo area, and powerful diesel engine. It has become one of the most purchased commercial vehicles due to its versatility, reliability, and spacious design.
To fulfill environmental compliance, the Sprinter van comes equipped with the BlueTEC system as a module, which operates effectively and significantly reduces emissions. However, whenever the system malfunctions, it becomes a headache for the owner.
Common Causes of Sprinter Emission System Malfunction
The Diesel Particulate Filter (DPF) Failure
The diesel particulate filter, or the DPF, is a soot trap in the Sprinter exhaust system. The soot generated by engine combustion gets trapped in the filter, reducing emissions. To clean the filter, the vehicle undergoes regeneration, where, under specific conditions, it burns the soot at a high temperature, completely breaking it down. This process occurs when the cars go through log hauls on the highway. If this process fails to complete, the filter gets clogged and malfunctions the emission system by putting excessive pressure on the engine.
The Selective Catalytic Reduction (SCR) System Failure
The selective catalytic reduction system, or SCR system, in the emission system of the Sprinter is a complex module comprising delicate components, such as the DEF pump, heater, and injector. It reduces the Nitrogen Oxide emissions of the vehicle. If one of the components in the SCR module fails, the system malfunctions, causing an emission issue.
The Exhaust Gas Regulation Valve (EGR) Malfunction
The exhaust gas regulation allows some emissions to be redirected into the engine chamber, triggering a mechanism that reduces toxic emissions. However, the exhaust gases are full of soot, and over time, they clog the valve, causing emission malfunction.
Warning Signs of Emission System Malfunction
The malfunction in the emission system triggers several functionality irregularities in many crucial vehicle components and causes the exhibition of several warning signs. These are;
- The Check engine light is on due to an emission malfunction in the engine.
- The DEF warning, unique to the BlueTEC system, is displayed on the dashboard.
- Reduced power output, and the Sprinter entered into ‘limp mode’.
- Significantly reduced fuel efficiency.
- The Sprinter is failing environmental compliance tests.
Solution for Emission Malfunction in Sprinter Vans
Diagnostic Inspections
Upon observing malfunction signs in emission, consider professional repair for your Sprinter Van before it progresses to severe damage. The repair process for emission malfunctions in Sprinter vans begins with a comprehensive diagnostic procedure. Replacing the components of the sophisticated exhaust system in the Sprinter is an expensive endeavor. That’s why accurate diagnosis is crucial. A general OBD II scanner cannot provide a proper diagnosis; therefore, a factory-grade scanner with a Mercedes-specific STAR/XENTRY system is used to determine the cause and origin of the malfunction.
Comprehensive Repair
Upon finding the underlying damage, appropriate repairs are conducted on the Sprinter. If the malfunction is related to EGR valve clogging, then a manual cleaning restores its functionality to a normal level. In the event of extensive filter damage, the valve must be replaced with a new one.
Similarly, the DPF valve, when clogged, is removed manually and cleaned using special cleaning tools. This is far more cost-effective than replacing it with a new one. However, if the damage is irreversible, the valve must be replaced with a new one that is of the same OEM grade.
If the DPF regeneration could be executed in the exhaust module, then using a factory-grade scanning tool, the technician initiates a forced regeneration while the vehicle is at rest. This clears the clogged shoots and restores the module functionality.
In the event of NOx (Nitrogen Oxide) sensor damage and DEF system malfunction, the damaged components must be replaced with OEM-made new parts.
Preventive Maintenance
Although the repairs restore the functionality of the Sprinter vans, it is best to adopt preventive maintenance practices that reduce the chances of malfunctions. These include;
- Ensuring the Sprinter gets regular and sustained highway driving at about 30+ minutes and 55+ mph, so that the DPF correctly completes the regeneration cycle.
- Always use high-quality fuel in your Sprinter, such as Mercedes-Benz-approved low-ash engine oil, high-quality Diesel Exhaust Fluid (DEF), and ultra-low-sulfur diesel.
- Try to minimize the idling period of the vehicle, as it negatively affects the exhaust system, especially the DPF system.
- Conduct timely maintenance as per the schedule provided by Mercedes.
Where to turn When Your Sprinter Raises Emission Issues near Green Bay?
For owners of Sprinter vans in Green Bay, 
Dell’s Service Center is the ultimate destination for auto service on European vehicles, such as the Mercedes-Benz Sprinter. To address the emission malfunction in your van, our shop features expert and certified technicians with years of experience in Mercedes-related repair issues. Our repair facility is equipped with state-of-the-art repair tools and factory-grade diagnostic equipment, ensuring accurate and reliable repairs for your European vehicle in Green Bay.
We ensure and improve the quality of our repairs by using OEM parts and components, as well as brand-approved fluids, in your vehicles. We provide a 12-month/12,000-mile warranty on most of our repairs and services. Our shop is located at 840 Vanderperren Way in Green Bay and welcomes residents of the area as well as those from surrounding cities such as Manitowoc and Sturgeon Bay.
* Mercedes-Benz Sprinter image credit goes to: Different_Brian.