Thanks for the continuing interest and replies. Bulk – can you please elaborate on what you mean by a “swapsie”?? As I mentioned, I replaced the tank and sensor with new, correct parts. How can just replacing these plug-and-play components affect or swap anything? Did I fail to do a procedure with the computer or something and the signal from the sensor lead wires got “swapped”? I’m a bit lost on what you are referring to. The reverse behavior I am seeing shouldn’t be caused by simply plugging in a new sensor, and there is only one way to plug it in.

Also, to do the “recode” – I assume you are referring to setting some flag somewhere – or “unswapping” whatever happened to begin with. Can you provide some detail? What is the parameter name and value and would I be using a GT1 or other software?

Terminator – you made me realize there is a test I could do; I could drain the expansion tank such that the float goes to the bottom and see if that makes the message go away. That would at least prove that there is indeed a magnet on the float and is working “properly” albeit backwards.

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2006 X5 4.8is
LeMans Blue over black
Style 168 rims
Blackout grills and hood vents
Aux jack