I have a 2010 Octavia FL 1.9 TDi PD engine BXE code. On warm start up it has started to make a horrible knocking noise but only when it is warm and you return to the car a few minutes and you feel the whole engine knocking and it feels like the exhaust is banging against the floor. Let the car go cold for an hour or so and it will start perfectly every time. I have had a new DMF fitted about a month a go as the clutch was getting very high and decided to have the whole lot replaced. The car has done 66k miles and it runs perfect with no other judders or running issues.

Also there has always been a rotational noise from the engine that sounds like a bearing noise but it's a slow noise in relation to the engine speed. If you operate the clutch this has no effect on this noise. This was another reason behind replacing the DMF.

Any thoughts or ideas on this would be great please?

I have the exact same issue as mentioned above.

rattling noise on warm startup, and sometimes the engine turns over and almost start and I have to try a few times before it fires up.

I also had the DMF replaced a couple of months ago.

Any suggestions on this?