motorhomealan

i have just had all new glow plugs x 6 and new dpf and it is still showing a fault on number 5 glow plug could this be the glow plug relay as i am at a loss with it. has anyone else had a problem like this. i have spoke to bmw about a new relay no problem however my mechanic has said to get a new loom from the relay to the glow plugs but bmw cant seem to locate the loom required any ideas?