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hello to everybody..i have an audi a3 tdi which got a sudden loss of power to it and when i checked the onboard computer it says i have an defective wastegate,is this an expensive problem and would it explain a slight whineing noise on the turbo....many thanks

hi everybody i am new to this and have just joined...ive got an audi a3 that got a sudden loss of power when i checked the engine management system it said i have a defective wastegate..is this an expensive problem and would it explain a slight whineing noise on the turbo....many thanks