Well since you asked! The TPMS BMW now uses across the entire model range has sensors in every wheel and all metal valve stems (not metal/rubber valve stems). Metal valve stem caps were interfering with the signals and so BMW includes only plastic (ABS) valve stem caps on these valve stems. In addition, to prevent owners from generating problems for themselves, the accessories catalogs now only carry valve stem caps in the BMW roundel, M logo, etc. styles made of ABS.
See attached representative photos:
1. ABS valve stem caps (BMW Roundel Logo - P/N 36-11-0-421-544)
2. Brass valve stem caps (BMW Roundel Logo - P/N 36-11-0-009-840)
3. Rubber valve stem (P/N 36-12-1-178-869)
4. Metal valve stem (with generic ABS cap) (P/N 36-11-1-096-449)
Quote:
Originally Posted by statdoc
Now I have to ask----the other reason?  |