Coolant Expansion Tank Kit, Rein - G30 530i 540i G32 640i G12 740i

This part is listed by BMW as BMW part number 17139846642 (17-13-9-846-642) and is described as CRP Rein Coolant Expansion Tank Kit for G30 530i, 540i (2017+), G32 640i (2020+), G12 740i (2017+), and G14/G15/G16 840i (2019+). This includes the plastic reservoir, integrated level sensor, and a new cap (cap should be replaced every few years to properly regulate system pressure).

This reservoir includes the coolant level sensor. BMW built the sensor into the tank and is not available separately. So if you have a bad coolant level sensor on your G30 530i/540i, G32 640i, or G12 740i you will need to buy the complete tank.

Supersedes the following BMW part numbers:
17139884859 (17-13-9-884-859)
17139487210 (17-13-9-487-210)
17138742975 (17-13-8-742-975)
17138610656 (17-13-8-610-656)
17117639020 (17-11-7-639-020)

This is a G30 coolant reservoir manufactured by Rein Automotive (CRP) - a front-line supplier of original equipment, private label, and in-house engineered replacement parts. Rein replacement products meet or exceed all of BMW's original design, fitment, and performance requirements and they carry out testing with ISO and German TUV for quality control. Rein parts are the best alternative to more expensive Original BMW parts because they are virtually identical without the inflated price tag. This part has a two year warranty.

For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.