Audi was running fine then one night started making a hooring loud noise and loosing power not allowing it to turbo, was fine when car was cold but as soon as it warmed up it started making the noise.

At first Like I thought it was a fucked turbo, just happens to be the turbo was recked. so replaced it with a brand new one cleaned the intercooler and pipes ect and was running fine. Drove it home on Saturday and haven't used it untill today drive from newtonhill to bridge of don and it's back making the same hooring noise with the same faults as last time. Sometime it goes to cut out but corrects itself.

Noise only happenes before 1500 rpm then lightens of then noise stops I personally think it's the chain cam sensor. Can anyone please let me know what they think

Cheers