Another few hours spent on the V40. I did a compression test, just in case, and everything seems fine, all four cylinders gave 170 reading.
As to the starting problem I think I found it.It seems there is no voltage getting to the MAF sensor. Reading between the thicker red power in wire and earth is a big fat zero. I double checked the fuses and changed the relay just in case and popped the bottom of the engine fuse box but nothing looks wrong.
I guess it might be a problem with a wire in the loom or the ecu .
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