The SCR catalyst uses DEF to convert NOx into harmless gas, and over time it can clog, crack, or lose efficiency. That brings on efficiency codes and DEF warnings that a sensor swap will not fix. We test dosing, back pressure, and the catalyst, then repair or replace the affected section.
What this service includes
- Verify DEF dosing volume and spray pattern at the injector
- Measure SCR efficiency and rule out NOx sensor faults
- Inspect the catalyst substrate and mixing pipe for damage
- Replace the dosing injector or catalyst and reset adaptations
Signs your Sprinter needs it
- Repeat SCR efficiency below threshold codes
- DEF crystals or leaks around the dosing area
- Warnings that return soon after other emissions repairs
What does scr catalyst repair cost?
Ballpark pricing for scr catalyst repair on a Sprinter runs $1,200 to $5,000. The final number depends on your model, mileage, and the exact cause, which we confirm with Xentry before any work is authorized. Diagnostic time is credited toward the repair. See the full pricing page.
Frequently asked questions
Why does the SCR efficiency code keep coming back?
If dosing and sensors check out, the catalyst itself is usually worn or clogged. We confirm with testing so your Riverside van gets the actual fix instead of another parts cannon.
Can DEF crystals damage the SCR system?
Yes. Poor dosing lets crystals build up and block the mixing pipe or injector, which hurts efficiency. Clearing that buildup is part of a proper SCR repair.