The VCDS shows 'boost pressure control(N75)' values is always 0, the "boost pressure(actual)" and "boost pressure(specified)" value didn't change with the engine speed .
so this means I need a new N75?
Thanks. I have checked the N75 and associated vacuum tubing.it's ok.
So air leak is not the reason for "P1555 - Boost pressure Control: Upper Limit Exceeded" ?
The pressure cannot be discharged, so the pressure is too high, rather than the leakage of the pipeline, which needs to be supplemented？
Thanks for your response.
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