my light came on on Sunday, 3 beeps and light flashing (light in temp dial)
scared the **** outta me as I'm new to Mk3 ownership and I thought it was an oil light.
checked oil & fluids, everything ok so assume its the sensor. Once warmed up, light stopped flashing, and has been fine since (touch wood)
thing is the temprature here plummeted to -3ish on Saturday night so think it was just the sensor.
just something to keep an eye on (like everything else on a mk3)