REPAIR SYSTEM 06

Emissions & aftertreatment.

DPF, DEF and SCR, EGR and NOx sensors. Repaired the emissions-legal way, before a derate leaves you stuck.

ON YOUR TRUCK

What fails on your engine.

Pick your engine to see the emissions problems we see most on that generation, what you’ll notice, why it happens and how we fix it.

Choose your engine above.

FROM OUR SHOP

Real work, real trucks.

EGR cooler and plumbing on a V8 diesel, engine out

THE BASICS

How it works, and why it matters.

What it does

Since 2007 diesel pickups trap soot in a diesel particulate filter (DPF) and burn it off in regenerations. Since about 2010 most also spray diesel exhaust fluid (DEF) into an SCR catalyst to cut NOx. Sensors before and after each part tell the computer whether it is working. When something drifts out of range, the truck warns you, then limits speed.

Why it matters

Most emissions problems start small: a lazy sensor, crystallized DEF, a regen that keeps getting cut short. Caught early, they are usually a sensor or a cleaning. Ignored, they become a plugged DPF or a speed-limited truck on the side of the road.

Warning signs

DEF or DPF warning lights
Speed limit or derate countdown
Frequent regenerations or a fan running after shutdown
Poor fuel mileage
NOx or DEF quality codes
Soot at the tailpipe on a DPF truck

What we check

Regen history, soot load and DPF pressure on the scan tool
NOx sensor and DEF quality readings
DEF pump, heater and doser
EGR valve and cooler
Forced regeneration or cleaning when it is the right fix

Keep it healthy

Use fresh DEF and keep the cap clean
Let regenerations finish (a highway drive helps)
Fix sensor codes quickly. We do emissions-legal repairs, not deletes