Anyone know what causes the "High Turbo Boost" fault code to flag up? This is following on from a previous post on fitting a Drake Tuning box to my engine. The fault occurs with the box fitted or not so its not the tuning box causing it. I have cleared the code using OPCOM each time but re-occurs if you accelerate enthusiastically kicking the turbo in. Accelerating gently does not cause the fault to flag up but who wants to drive like a Granny every where?