Hi guys, we have a 2009 Octavia 1.6cr see diesel that went into limp mode. We had the flashing coil and then limp mode. Before it goes into limp mode we get the coil flashing and a whooshing turbo noise from the engine somewhere. it is not the turbo. It is NOT a lose or split pipe as the garage have been all over the engine. We have the error code for an air leak but even blowing smoke through the system shows no leaks. Does anyone have any idea where to go from here? Many thanks.

Anybody?