My engine management light has come on and my obd-II shows it has fault code po117.
When I start my car first thing the fan kicks in straight away but once driving it goes off,but the temp gauges rises to top centre at 90degrees then doesn't move either way. I have been told that I have a faulty coolant sensor and that it needs replacing....could anybody back this up please and confirm that this is the problem

 

I'll be happy to help. But first, tell me:

Which Audi model you are having problems with, and the model-year.

What this helps me do is this:
Re-direct your question to the appropriate sub-forum, for your model/model-year, in case there's something specific to your model/model-year that helps define the problem.

 

Thanks for your help
My car is the a4 1.8t quattro 2003