I noticed some smoke coming out from under my bonnet today. I opened it up and noticed it was coming from a leaking pipe on top of the turbo. This is a older pic of the leaking pipe. Its leaking between the nut and the pipe. I'm tempted to just take a spanner to it but wondering if there is a washer or seal that could do with replacing. Any one got any hints or tips for doing this? A4 1.9 110 TDI 1998 AFN engine.