I wasn't aware the n52 also has the belt ingestion problem.

Mine tried but i caught it fast enough only the main seal damaged and i was able to get a tool to pull the old seal and replace it. Smoke test will confirm if the seal is blown.

Did you get a check engine light too

Serpentine belt
 

very much so! If the seal on the front of our room is torn it vents to the crackcase


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So my indy tech gave the car a once over and changed the tensioner and cleaned out all the pulleys and thankfully the crank seal was not damaged
But now i am still getting the P112F and P0171 code, when i start the car it revs and little high for a few seconds but settles, there is also a occasional slight hesitation
Any ideas what i should check

0171 is intake leak i think. Smoke test best fix. However here's a decent overview of problems related to your errors:

https://carolinasbmwmoa.org/how-do-i...mw-p112f-code/

I had a slew of errors related to intake pressures on my n55 motor and there is a TSB to recover i don't know if it applies to n52 but I'd try it if it was my car.

https://www.tsbsearch.com/BMW/SI-B11-09-19

You can look through the tsb for your error and engine see if there's a known issue.

I saw one post said guy had your error and cleaning the purge valve resolved the issue.