What would cause these?

[dirtydubber]

As the title says, what would cause this combination of fault codes?

17608 - Recirculating valve for turbocharger - N249:mechanical malfunction.
16711 - P0327 Knock Sensor 1 Circ Low Input
16502 - P0118 Engine Coolant Temp.Circ High Input
16795 - P0411 Sec.Air Inj.Sys. Incorrect Flow Detected
17705 - P1297 Connection turbocharger - throttle valve pressure hose

First time all five codes were present, second time 17705 was not there, but it turned up again today, but 16502 was not present today.

 

[BeartheBruce]

Have you looked at the Ross-Tech Wiki? http://wiki.ross-tech.com

 

[dirtydubber]

Yeah, I looked there, but it seems to suggest a different problem for each code mostly, and as all codes have shown up together at the same time, 3 times in a row, I am thinking that there is just one underlying cause. Just wondering if anyone has had the same or similarfault codes appear simultaneously, and what they found the cause to be. I dont have a huge amount of time available to tinker with the car looking at "maybes", due to the shift paterns I work