Have you checked the tip connection to the turbo? My clip died and was slowly loosening over time causing a hiss. Never had any codes or limp mode though.

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Have you checked the tip connection to the turbo? My clip died and was slowly loosening over time causing a hiss. Never had any codes or limp mode though.

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I recently fitted this i know what u mean was an absolute bitch to get the jubilee clamp to stay on the flange of the turbo. I wedge a stubby screwdriver in and tightened as much as I could on the clamp. Im sure its tapered tho so may well wiggle loose in time
 
I recently fitted this i know what u mean was an absolute bitch to get the jubilee clamp to stay on the flange of the turbo. I wedge a stubby screwdriver in and tightened as much as I could on the clamp. Im sure its tapered tho so may well wiggle loose in time

Best way to check is get under the car and look up at it


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Just a quick update on this post. I found the problem!!! The rubber hose that connects the n75 to the intercooler piping had a huge split in it just by where it was clamped with a jubilee at the cooler pipe end. Probably a combination of old rubber and tightening too much (heavy handed).
Thank god for that it was doing my head in
 
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