I am looking at buying a 1997 bmw 540i with a 150000 miles on it and wanted to know what the reliability of the car is and how much more I can get out of it. Also, the owner said it needs a new transmission module sensor and said the local AAMCO transmissions said it would cost about $167 for the part and another $125 for labor, does that seem reasonable? or is this a bigger problem? If I end up buying it I would bring it to a local garage to have it checked out first but wanted to get your guys opinions