S204 c220 cdi p0299

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Hello all, So last week the engine management light came on . My brother came by with his obd2 reader and brought up code p0299 (turbo/supercharger under boost) . He deleted the code but today it came back up on my way home from work . I felt the code come up , the revs changed instantly . The car isn't in limp mode and still picks up speed but not as quick as usual . Normally , put foot down , drops a gear or 2 and your off like a shot ! It does still drop down and picks up speed but there's no oomph like usual. Have also noticed that when slowing down, the down shift on the auto box is much more noticeable , kinda jolts you a little . Also the exhaust sounds a little blowy. I know this code can point to a number of problems but Please if any one has experienced this behaviour before or have any idea what side of things I might be looking at before forking out at a dealer then i would be very very much appreciated, covid hasn't been kind and very low on funds . Thankyou for taking the time to read my thread .