Pouring diesel, water, or the wrong fluid into the DEF tank contaminates the whole reductant system fast. Left in place it damages the pump and dosing injector. We drain the contaminated fluid, flush the tank and lines, replace fouled components, and refill with fresh AdBlue so your Sprinter doses cleanly again.
What this service includes
- Drain and safely dispose of the contaminated DEF
- Flush the tank, supply lines, and pump of residue
- Inspect and replace the DEF pump or injector if fouled
- Refill with fresh AdBlue and confirm dosing pressure
Signs your Sprinter needs it
- You know the wrong fluid went into the DEF filler
- Reductant pressure or dosing faults after a fill up
- Cloudy or oily looking fluid in the DEF tank
What does def tank contamination flush cost?
Ballpark pricing for def tank contamination flush on a Sprinter runs $500 to $2,500. 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
What happens if I put diesel in the DEF tank?
Even a small amount of diesel contaminates the reductant system and can ruin the pump and injector. Do not start the van, and have it flushed before the contamination spreads.
How much does a DEF flush cost around Riverside?
It depends on how far the contamination traveled and whether the pump or injector survived. A quick catch is far cheaper than replacing the full reductant hardware.