Hey guys,

I have an e39 540 that gets a check engine light when the RPMs reach the upper numbers.

The codes are:
75: Misfiring with cylinder cutout, total
64: Misfiring with cylinder cutout, cyl. 2
62: Misfiring, sum, relevant to exhaust gas
51: Misfire, cyl. 2

Can anybody tell me what these mean or what possible causes are??

Thanks!