Hey Scotty, been watching you on YouTube for a long time, thanks for all your videos.
I have a problem with my 2007 Audi S4 Cabriolet with 175k miles. 4.2L NA/DCT European version. I have a persistent check engine light that after scanning says Right Bank Air/Fuel too Rich/Lean. I have tried to get more, but that's the only major code and it's been an issue for about a year.
It runs fine, the timing isn't off, there's no chain click, I have swapped the sensors, injectors, replaced the gas cap, and run a can of Cata clean through it. If I clear the trouble codes it's fine until I refuel and usually (Not always) comes back on after I leave the gas station. I would pull the head and check the ports but I cut my right hand off(70%) a couple years ago, so my wrenching days are mostly over.
Can you think of anything else?
Where are those stupid Audis off in carbon up? See if you can pay a guy to carb and clean the engine with a pressure machine. The only other thing I really see is a lot of times they'll get intake manifold leaks on that side which will cause the same problem
