Header tank - water level sensor


Registered User
Hi all,
This is on a 2012 3.0TDi S-Line Avant.
Had a couple of 'false alarms' recently with the car telling me it's short of coolant, when it obviously wasn't. The first time it simply went away when I restarted the engine, the second time it persisted but went away after I waggled the wires on the sensor unit.
So it's maybe a loose or dirty connection there. I couldn't make out if the sensor has a plug/socket arrangement, or if it's hard-wired in. Does anyone happen to know? If it's a plug I couldn't see how to get it out.

header tank.jpg


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VCDS Map User
Scratch the prongs on the reservoir with a flat screwdriver, see if it goes away.


Well-Known Member
VCDS Map User
You need either lift the tank up slightly or remove the tank to get to the connector underneath.