Vivaro keeps blowing air flow sensors?

Hi all, Just purchased a Vivaro privately and after 2 days of owning it i lost all revs. After diagnosing it to the air flow sensor i replaced it and it was great again.. until the same fault came up and it had burnt out another air flow sensor... can anyone shed some light on this problem for me? The oil level is fine, the wiring loom seems ok, i even checked the power from the plug with a multi meter and all the voltages are as expected.
HEEEEEEELLLLLLPPPPPPPP... (please)