I Cut Open a DEF Tank | The Real Cause of P203B31 Fault Code
Автор: Sprinter Doctor
Загружено: 2026-01-25
Просмотров: 1897
Описание:
In this video, I cut open a failed DEF tank to find the real cause of fault code P203B31 – “The AdBlue fill level sensor has a malfunction.”
The tank vent was clogged internally, causing the DEF tank to collapse and prevent the ultrasonic level sensor from working correctly. After opening the tank, I found a plastic diaphragm / one-way valve inside the vent that had stuck closed.
This video shows what’s inside the DEF tank, how a clogged vent can collapse the tank, and why this leads to false fill-level sensor faults on Sprinter vans.
#SprinterVan
#DEFSystem
#P203B31
#AdBlue
#SprinterDoctor
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