Hi, New to the forum so wondering if anyone can help at all.

I have two Linde H2X394W with poor running issues. One Linde has know stopped running completely, it just turns over with black smoke out the exhaust.
P1666 relates to injector 1 : Electronic Malfunction. The comon VW fault is the wiring loom in the engine that feeds each injector. we also replaced the injector. The fault hasnt been rectified. We called out Linde who have said this is a very common fault across this engine range and they don't know how to fix it after these repairs have been done. Has anybody had this fault ? The engineer couldn't access the engine software with his laptop.