Have a disco 4 that has a fault that will clear on its own, It is very intermittent, but needs sorting.

It shows on the display restricted performance and the accompanying codes.

P00BD Mass or volume air flow circuit range/performance air flow too high.

P0235 Turbo charger/supercharger boost sensor A circuit

P006A Manifold absolute pressure - mass or volume air flow correlation

P0528 Fan speed sensor circuit No signal.

When it goes in to restricted performance, it sounds like an air hose is split, smoked it and no leakage.

Have renewed both air flow sensors with oem ones, vehicle has been ok for a month.

I'm thinking CSOV (compressor shut off valve) any idea how to test and prove this item is faulty.

Many thanks

Steve