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Turbo boost down, when changing gear i can hear a release of air from the turbo, only when high revs though, have the above code from PP2000

Fault code P0246
FAULT LOCATION: Turbocharger Wastegate Regulating valve A circuit high
PROBABLE CAUSE: Short circuit to positive or value too high. TC waste gate regulating valve, ECM

How do i check the wastegate valves and which one is A?

There are three of the same BOSCH wastegates in the engine bay

Also i only had my CAT replaced 2 years ago
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