Aftertreatment Repair
Get Professional Emissions Diagnostics, Cleaning & Repairs That Last.
From advanced DPF cleaning to complex SCR system repairs, we deliver complete diesel aftertreatment solutions designed to restore performance, maintain emissions compliance, and prevent costly downtime. With fast turnaround times and transparent pricing, we help keep your diesel engines running clean, powerful, and reliable across every route and operating condition.
Clear the Codes. Restore Your Power.
Modern diesel emissions systems are highly sophisticated and notoriously sensitive. When your DPF (Diesel Particulate Filter) or SCR (Selective Catalytic Reduction) system fails, it doesn’t just trigger a dashboard light—it kills your fuel economy and can put your entire truck into “Limp Mode.”
OKC Fleet Services specializes in the “black box” of diesel engines. We don’t just clear codes; we find the root cause. Whether it’s a faulty DEF doser, a cracked DOC, or a clogged DPF, our technicians use specialized equipment to restore your system to factory efficiency without the dealership price tag.
OKC Fleet Services specializes in the “black box” of diesel engines. We don’t just clear codes; we find the root cause. Whether it’s a faulty DEF doser, a cracked DOC, or a clogged DPF, our technicians use specialized equipment to restore your system to factory efficiency without the dealership price tag.
Comprehensive
Aftertreatment Solutions
We provide end-to-end care for every component of your exhaust aftertreatment system, including inspection, diagnostics, cleaning, repair, and replacement of key emissions components such as diesel particulate filters (DPF), selective catalytic reduction (SCR) systems, diesel oxidation catalysts (DOC), and exhaust gas recirculation (EGR) systems.
DPF Cleaning & Restoration
State-of-the-art thermal and pneumatic cleaning to remove ash and soot. We restore flow and extend the life of your filter to avoid costly replacements.
SCR System Diagnostics
Solving “Exhaust Fluid Quality” and “DEF System Failure” messages. We test sensors, pumps, and injectors to ensure your SCR is reducing NOx effectively.
DOC Inspection & Service
The Diesel Oxidation Catalyst is the first line of defense. We inspect for face plugging and structural integrity to ensure your engine breathes correctly.
DEF System Repair
Is your DEF heater, pump, or tank acting up? We diagnose and repair Diesel Exhaust Fluid system components to keep you compliant and out of “Derate” mode.
EGR Valve & Cooler Service
Carbon buildup in the EGR system often leads to aftertreatment failure. We clean, repair, or replace EGR components to prevent downstream DPF clogging.
Sensor Replacement (NOx & Temp)
Faulty sensors are the #1 cause of false alarms. We use high-quality OEM or equivalent sensors to ensure your ECU gets accurate data.
Complete System Replacement
When a core is cracked or “baked,” cleaning isn’t enough. We source and install high-quality replacement DPFs and DOCs to get you back on the road.
Forced Regeneration
If your truck can’t complete a regen on its own, we perform stationary forced regenerations and investigate why the automated process failed.
The OKC Fleet
Aftertreatment Process
Deep-Dive Diagnostics
We don’t just read the code. We perform a back-pressure test and sensor scan to see exactly where the restriction or failure is occurring.
Visual Inspection
We use specialized cameras to check for internal cracking or “melting” of the filter substrate. If it can’t be cleaned safely, we tell you upfront.
Precision Cleaning or Repair
Using industrial-grade DPF cleaning equipment, we remove 95%+ of ash and soot. If parts are failed, we replace them with quality components.
Verification Testing
After service, we reset the ash counters and perform a test run to ensure the system is communicating perfectly with the engine computer.
Performance Report
You receive a summary of the work performed and the “before and after” stats of your system’s flow and efficiency.
Why Trust OKC
Fleet with Your Emissions?
Emissions Specialists
These systems are complex; our techs are specifically trained in the chemistry and physics of aftertreatment.
Advanced Flow Testing
We don’t guess. We measure air flow before and after cleaning to guarantee results.
Fast Turnaround
We know every day your truck is in the shop is a day it’s not making money.
Warranty Backed
We stand behind our aftertreatment repairs and parts.
Service Area
We serve diesel truck owners and fleet operators throughout the Oklahoma City metro area, including
4.9 out of 5 Stars on Google
Don’t just take our word for it — hear from fleet managers who trust us daily.
Best of OKC
2024, 2025 & 2026 Award Winner
NAPA Certified
Truck Care Center
FAQ for Aftertreatment Systems.
Quick answers to common questions about our services and processes.
1
What aftertreatment services do you provide?
Diagnostics, cleaning, and replacement services for DPF (Diesel Particulate Filter), DOC (Diesel Oxidation Catalyst), and SCR (Selective Catalytic Reduction) systems.
2
Why does aftertreatment system maintenance matter?
A failing aftertreatment system can hurt fuel economy, trigger derates or fault codes, and eventually leave a truck out of service.
3
How do I know if my DPF needs cleaning?
Common signs include frequent regeneration cycles, reduced power (derate), increased fuel consumption, and dashboard warning lights related to the emissions system.
4
Do you clean filters or only replace them?
We offer both — our team diagnoses the issue first and recommends cleaning or replacement based on the condition of the component.
5
Can aftertreatment issues cause my truck to fail inspection?
Yes, faulty DPF, DOC, or SCR systems can trigger emissions-related fault codes that lead to inspection failures, which is why regular diagnostics matter.
Ready to Clear
the Clogged Filter?
Fast diagnostics. Deep cleaning. Zero guesswork.