DPF / SCR Regen & Aftertreatment Service
Welcome
On-Site DPF Regeneration, SCR System Repair, and Emissions Diagnostics
NoCo Diesel Services LLC provides expert mobile DPF regen and aftertreatment system repair for diesel trucks, heavy equipment, and commercial fleets. Based in Johnstown, CO, we offer 24/7 mobile service across Northern Colorado, Wyoming, and Nebraska.
If your truck is in derate mode, displaying emissions system faults, or failing to complete a regen, we can help. With advanced diagnostics and forced regen capabilities, we restore performance and compliance without a tow or trip to the dealership
Certified Expertise in Diesel Emissions
With over 15 years of diesel repair experience and specialized factory training through International and Kenworth, we understand the complexity of modern aftertreatment systems. Our lead technician brings dealership-level diagnostic skills to the field, saving you time and cost.
We follow manufacturer specs for testing, sensor replacement, and wiring repairs. If your system needs shop-level service (such as filter baking or component replacement), we’ll advise you honestly and help coordinate the next steps.
Mobile DPF Regen and Aftertreatment Services
A passed DOT inspection means your truck or trailer is safe, compliant, and road-legal for the next 12 months.
- Forced DPF Regen (Parked and Stationary)
- SCR Diagnostics and Repair
- NOx Sensor Replacement
- DPF Differential Pressure Sensor Testing
- DEF Heater and Pump Diagnostics
- Check Engine Light and Fault Code Resolution
- Derate Condition Recovery
- Wiring Repairs for DPF and DEF Components
- Exhaust Temperature Sensor Replacement
- Aftertreatment Control Module Testing
We bring the right tools to the site—including OEM diagnostic software—to read, clear, and resolve aftertreatment faults efficiently.
When to Call for DPF or Aftertreatment Repair
If your diesel truck is showing any of the following symptoms, it’s time to schedule mobile service:
- Engine derated or won’t exceed 5 mph
- “Service DEF System” or “SCR Fault” messages
- Flashing or solid check engine light
- Repeated failed regens
- Poor fuel economy or loss of power
- Strong exhaust odor or excessive soot
- DEF system freezing or fluid issues
- Trouble codes related to emissions systems
We service trucks on the roadside, in yards, or at job sites. Our priority is getting you back in service quickly—without waiting days at a dealership or risking further damage.
24/7 Emergency Aftertreatment Support
Emissions-related faults can shut a truck down with little warning. That’s why NoCo Diesel Services LLC offers 24-hour emergency response for DPF, SCR, and DEF-related problems.
We respond fast to:
- Trucks stuck in derate mode
- Failed or interrupted regen cycles
- SCR and NOx sensor failures
- DEF delivery and heating system faults
- DPF system sensor code chains
- Overfull soot levels preventing automatic regens
Our technician has the training and tools to perform on-site diagnostics and forced regen services—even after hours or on weekends.
What Is the Aftertreatment System?
Modern diesel engines are equipped with emissions control systems to meet EPA standards. These systems reduce soot, nitrogen oxides (NOx), and other pollutants using a series of components often referred to as the aftertreatment system.
Key components include:
DPF (Diesel Particulate Filter)
Captures soot and ash from exhaust
DOC (Diesel Oxidation Catalyst)
Converts harmful gases into less harmful substances
SCR (Selective Catalytic Reduction)
Uses DEF (diesel exhaust fluid) to reduce NOx
DEF System
Includes tank, injectors, sensors, and lines to manage fluid
NOx Sensors, Temperature Sensors, and Differential Pressure Sensors
Welcome
Aftertreatment Support for Fleets
We offer structured emissions system maintenance for fleets, helping reduce roadside failures and prevent costly derates. Preventive aftertreatment service includes:
- Scheduled forced regens for high idle fleets
- DPF pressure testing and soot level checks
- DEF system inspections and filter changes
- Sensor condition checks and software resets
- Tracking regen frequency for at-risk units
Our mobile fleet maintenance support helps keep your vehicles running longer and more efficiently.
Call Now for Mobile DPF and Aftertreatment Service
Don’t let a failed regen or emissions code stop your truck. NoCo Diesel Services LLC offers fast, reliable on-site repair for DPF, SCR, and DEF system problems. Call now to schedule service or request immediate dispatch.