The DEF tank heater keeps AdBlue thawed so it can dose in cold conditions. When it fails you get DEF warning messages and a restart countdown that can strand your Sprinter. We test the heater circuit, tank sensor, and control, then replace the failed heater and clear the lockout.
What this service includes
- Read DEF heater and reductant faults through Xentry
- Test the heater element, relay, and wiring for continuity
- Replace the tank heater or integrated sender unit as needed
- Reset the restart counter and verify dosing resumes
Signs your Sprinter needs it
- DEF warning with a limited restarts countdown showing
- Heater circuit or reductant system codes stored
- Van will not clear the DEF message after a refill
What does def heater replacement cost?
Ballpark pricing for def heater replacement on a Sprinter runs $600 to $1,600. 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 my Sprinter show a DEF countdown?
The system limits restarts when it cannot dose DEF correctly, and a failed tank heater is a common trigger. We fix the fault and reset the counter before it reaches zero and locks you out.
Can I keep driving with a DEF heater fault?
For a short time, but once the restart count runs down the van will not start again. Around Riverside we recommend booking before the number gets low so you are not stranded.