A6 1.9 TDi coolant temperature sensor

[PFPH]

My 2002 A6 temperature guage is fluctuating between 60 to 90 and I think is is the coolant sensor. Can anyone help on locating it?

[kenney]

need your engine code

[PFPH]

Awx

[kenney]

Hi the temp sensor you will find at the rear of the cylinder head,(drivers side) below the boost hose.It has 4 wires running to it.

[PFPH]

Thanks
I can see it.
To get the connector and clip off you need to be a contortionist with very thin arms.

[Padwick]

Anyone got a guide to changing this? Would a faulty one of these cause the engine to over-rev, especially when starting? My guage in the car sometimes reads 90, sometimes sits at around 70, sometimes at 0, which can change at anytime even during driving.
Thanks.

[lonky]

This sensor mucking around can cause the idle to be unstable. It's cheap to change.

Different versions are different colours, so difficult to fit the wrong part.