Help needed vw caddy tdi

Eddieg

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I bought a 05 vw caddy a few weeks ago yesterday it felt down on power then I turned it off and an again and the engine management light came on showing p0237 and on occasion it shows p0236
I now have no boost at all I cleared the fault but it's still pending p0237
I changed the boost pressure sensor for a known working 1 cleaned all contacts and checked voltage but still nothing helped can anyone help me out maybe someone can shed some light on this for me any help would be greatly appreciated it's a 1.9 tdi 105 bhp
 
Thanks for all your help turned out to be a damaged wire