I have a 2018 W12 6.0 Bentayga with engine misfiring in bank 1. I replaced 12 spark plugs and 6 ignition coils in bank 1. But the car still has misfiring in cylinder 1 and 2. I suspect that there is a vacuum leak. Can anyone please help with it?

The codes I am getting are for random misfiring and misfiring in cylinder 1 an cylinder 2.

 

I found the rubber seal of fuel nozzle #7 was defected which caused a misfire, even after replacing all sparks and plugs. Replacing the seal eliminated my problem.

 

Can you olease share pictures ?

 

red arrow, this was my case, won’t hurt to double check yours