Temperature sensor or something else?

Hi. I have a 2007 TFSI with a dodgy temperature gauge. It does take a while to warm up but then gently fluctuates between 70 and 90 degrees. Seems to follow a pattern of staying around 80 degrees but then drops if I am ambling along and rises to 90 if I hammer it or am sitting in traffic. I have no fault codes coming up but am wondering if this might be a dodgy sensor or maybe thermostat? Does anyone have any ideas, as I don't want to change things for the sake of it and find it has no effect.

Hamburgalarr said:

This may sound odd but try turning down your cabin temp to 19c I did this and the problem magically went away. Also I have been told by mechanics this is normal and fine thermostat working properly.

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Thanks. I'll give that a try. Anything not to spend a fortune hunting down a problem. I have only had the car for less than a year but the temperature "issue" only really started when I put the heating on in the car. Before that I seem to recall the gauge always sitting rock steady at 90.

Tried the 19 degree cabin temp setting but unfortunately it made no difference. I can only assume that either the temp sender is failing or the thermostat. The temp sender seems to be the easiest to replace but has anyone got a "how to" on doing this on a 2.0 litre TFSI BWA engine? I think I have found the location of the sender but just want to check how simple a job this is.