Originally Posted by Ricky Bobby

I haven't heard of many oil pump failures on M54's unless you have a ton of sludge in the bottom of the pan, have you done recent oil changes and all looked good on drainage? If so I wouldn't believe you have a failing oil pump but I've been wrong before.

My first suggestion is get the faults scanned with DIS then we will know whether its just an electrical fault at the switch or not.