Oil Sensor

[Len]

I keep getting a Warning message and buzzer which says - Workshop Oils Sensor.

This only happens when car is cold. At other times I do get an oil level warning flashing.

Now there is plenty of oil in the engine and its of a good condition (not due for a change for 4-5 months)

So what is causing this warning?



(W reg 2000 1.8T)