E39 (1997 - 2003)
I recently got a CEL and the Peake code 0F50, 0F51, 0F5D seem to suggest it's related to SAP, I tried to clear it but it will come back within a few days.
I read a lot DIY's about SAP but most are for I-6 engine where the air valve is easy to access, I had a hard time locate the air valve which...