Prado 120 error code p2588 generic?

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Got vsc lights and check engine light on now, as well as error p2588 generic $07e8, Turbocharger boost control position sensor b circuit low, seen with my obdii scanner. Mechanic says replace turbo . Close to $5000 for oem unit !!!! Anyone else with same error and had it sorted, why vsc lights if turbo problem? Very confusing. Other recent repairs make this a big ask.