Audi A5 Quattro Questions

Unanswered Audi A5 Quattro Questions

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my slip joint is rusted tight. should i hit the ujoints on and off of the steering rack and pinion so i can get the transmission out to repair it?
check engine light was on and fault code p2099 which is the turbo lost
I've changed the manifold,#1fuel injector,filter,spark plugs and coils,map sensor-purge valve..ran down all the gas twice...engine light back on..still running lean