Golf MK 4 2003 1.9Tdi , Coolant expansion vessel water level sensor problem

[spike47]

Hi
I have a Golf MK 4 2003 1.9Tdi , and the Coolant expansion vessel water level sensor keeps beeping out a warning when I start up in a morning ( Mainly a cold-ish morning ) saying on my dash "STOP" Water level check, but the level is ok, al that I can see in the expansion vessel is 2 metal rods going into the water, so I can't see what the problem is, done a diagnostic but nothing showing up.
When the engine warms up a bit, sometimes just after a couple of minutes, I can switch off the engine and restart and it is ok

Cheers
Spike

[Lucas_R]

It’s probably just a faulty level sensor (the 2 prong thingy you can see in the expansion tank). If you buy a new expansion tank it will come with a new level sensor fitted.

[spike47]

Hi

Thanks for your reply, here is only 2 metal prongs in the bottle that connect to the plug , I didn't think they where the actual sensor, in th edrawing it shows ( sort of) feed from the bottle to the sensor, but know idea where the actual sensor is located , could it be withing the cars "ECU" .

cheers
Spike