M5 Expert (>4000)
Join Date: Oct 2010
Location: Cobourg Ont
Thanked 1,968 Times in 1,652 Posts
My bad. I re read your first post and got it wrong the first time.You replaced a CPS and switched it side for. Then you swapped the boards side for? Through all this the code has remained the same? You have cleared the codes in between? I assume yes.
Could be hydraulic but finish checking the wiring first. There is this strange ground fault, it is located in the injector wire housing, but you need not go there just jump a wire to the grounds of the boards. A temp wire with a couple of alligator clips. Find a good/easy bolt and clip there then to the ground wire on the board. If no change then think hydraulic.
If it is hydraulic with that code it would be piston seals failed, unusual but there is a kit for it. Many posts on the system, I have no experience with it. In all the cars I have seen I have never seen anything but board failure.
If you want to read about the failure. It was first posted by one of the Aussies put vinegar in your search as this is how he cleaned it. Sorry don't remember who but the Aussies like to start their names with M5.
Last edited by Sailor24; 9th November 2016 at 09:51 AM.