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MY 2012 XF S Portfolio Ultimate Black
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I Will investigate further and let you know how I get on.

No pending or permanent fault code stored which is making it even harder to pin point
Non permanent faults are based on some calculations which only happens under particular situations. Like a problem with secondary turbo that only show up under heavy load and that means the situation is not stable enough for the car to make a proper conclusion.
SDD have a routine for this. If there is no boost leakage, you could follow the steps and it will report what part is causing problem.
 
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