I recently bought an OBC on Ebay with the intention to fit it in my oil burner but all I get is the infamous 'PPPP' message. I had to modify the live feed to get it to work at all (found that mod somewhere too) After reading a few threads on this I gather that there are TWO types of OBC fitted to E34's so do I assume that I have got the wrong one?

Are there any E34 diesels out there with an OBC fitted? If so, what is the part number of the working OBC?

The (non-working) one I have is numbered 65.81-1389619 and 65 91 11.19.11. Not sure which is the part number though.