I have a 2002.5 GLI (VR6-24v). Every winter, first thing upon starting up on a cold day (less than about 40 degrees F) my coolant temp light goes on (flashing). I've read the following code, which appears to be related to the dash light:
16500 - Engine Coolant Temp. Sensor (G62): Implausible Signal
P0116 - 35-10 - - - Intermittent
If I drive around for just a few minutes and cycle my ignition, it won't come back -- not even if I turn off the car completely and start it up a few hours later. It also never occurs during the summer.
This only happens on cold days, first thing in the morning, which leads me to believe it has something to do with the coolant temperature being too cold... I run with Genuine VW coolant (pink) mixed 50/50 with distilled water. I even added a little more coolant (to make it about 60/40) just in case, but to no avail.
I've also replaced my temp sensor (now have the green one) and reset the code via VAG-COM, but it keeps coming back.
Anyone else have a similar issue, or any ideas on how to solve this??