I am currently battling a nasty problem with my e34 535i.
The gauge cluster was not showing Temp, Fuel, or the Check Control. "Bad Capacitors," I figured. I replaced the cluster with a known functional model, and the SAME problem persisted. Also, the OBC reads "PPPP." When I swapped it into a different car, the OBC worked fine.
WHAT'S the deal-o?