Aftertreatment issues snowball fast - derates, fuel burn, and parked regens kill productivity. Use these checkpoints to decide when to regen, when to clean, and when to book service before you get sidelined.

1. Regen Frequency & Soot Load

   More than one parked regen per week or soot load rising faster than normal means the DPF is filling or doser is weak. Schedule a forced regen with data log to confirm.

2. Dash Lights: Check Engine + DEF/DPF Icons

   Combo lights often mean NOx sensor failure, DEF quality/frozen, or DPF delta-P sensor issues. We scan, validate pressures, and swap failed sensors with OEM parts.

3. Excessive Idle or Short Trips

   Stop-and-go routes load soot quickly. Plan a weekly highway run or schedule shop regens; consider an earlier DPF cleaning interval (120k–150k mi).

4. DEF Crystals at the Doser

   White crust indicates leaking or over-dosing. We clean, inspect injector seals, and run a doser quantity test; left unchecked it will clog the decomposition tube.

5. Fuel Economy Drop & High EGTs

   Backpressure from a loaded DPF increases exhaust temps and fuel use. A cleaned DPF restores flow and protects the turbo from added strain.

6. When to Bake & Clean vs Replace

   Clean: normal ash load, no melted substrate, <400k mi since last. Replace: cracks, melted bricks, heavy face plugging, or repeated 5246/4364 codes after cleaning.

Our Aftertreatment Service

- Forced regens with delta-P and NOx monitoring.
- Off-truck DPF baking and flow testing with reports.
- DEF system tests (quality, dosing, line heaters, pumps).
- Exhaust leak and flex inspection to stop false readings.
- Calibration updates when OEM releases fixes for nuisance codes.

Book DPF/SCR Service

Call 610-419-1247 or schedule a visit. We’ll inspect, regen, and clean so you pass your next DOT and keep regen counts low.