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How to overcome the error P1101 - the calculated and actual air consumption do not match. We change the valve cover because there is a membrane for regulating the flow of crankcase gases + oil separator, we change the ventilation pipe from the intake manifold to the turbine - because there is a check valve closing the flow-boost from the turbine towards the intake manifold and if it does not work, this leads to a rupture of the membrane in the valve cover, we look to see if there is a mushroom valve in the intake manifold, we clean this channel of the manifold, remove and clean the throttle assembly. Rosteco Art 20625 Opel GM membrane, crankcase ventilation pipe corrugation 25193343