Hi ive got an ongoing problem with diesel knock when 1k to 2k revs, very rough idle when cold and very very rough when its doing a regen. 

I thought id take pictures of the if the codes intop if the injectors and check the code adaptions of each on vagcom. 

1,2 and3 are great and match but 4 injector says code A4JFGH but my injector 4 on vagcom says in pic below, really weird, cant alter it either, old copy of com i know. 

Edited 12 July, 20205 yr by Jamesey

I have no knowledge of this so hope someone else can help you but in the meantime, make sure you have a good, strong, healthy battery. They hate duff, old, worn ones!

Yes very strange mate, im just hoping to get this number 4 recoded and my diesel knock and high mpg will be gone. 

If not its back to square 1, this pic is inj 4