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Message: <blockquote data-quote="xcrave" data-source="post: 511679" data-attributes="member: 21738">LOL... based on what ive read... its your Temp Sensor located at the bottom of your expansion tank...<img src="http://www.bmwmobiletradition-online.com/bmw/diagrams/a/s/73.png" alt="" class="fr-fic fr-dii fr-draggable " style="" />REFER Item #20<img src="http://www.argyrides.eu/bmw/mods/wp_exp_ten/images/21.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />When the thermostat failed it will give a false reading and will increase pump speed, will interfere with ALL of your car electronic...this will then produce all sort of problem as the car work harder to reduce temperature of the "false" high temp.HOW THE THERMOSTAT WORKS?*When the car is producing heat the thermostat will "open" by stages signalling to the waterpumps, fans and such to increase speed...When the thermostat is "Stuck" on "Open" stage it will give the highest reading and then force every related item to increase cooling... dont ignore this it may kill your UDM!!!My bet 100% will be on the T-Stat that son of a gun is always there to ruin a good car <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />Get it changed and then you decide on other things... it will not cost you as much as all those ECU +++ changes....</blockquote>