[Black dog]

I'm finally getting around to troubleshooting a boost issue on the v70. It's had a boost issue since I got it.
It is lumpy to drive no power down low and then the boost comes in all of a sudden around 1800 rpm. It then pulls all over the road with torque steer. It feels and sounds to over boost then, there is a slight wine from the turbo like its under far too much pressure.
It's got fault codes p003a85 and p029900
It's been smoke tested for leaks and has none. I'm certain it's over boosting although reporting under. I've read identical problems on the v60 threads but no conclusions.
I suspect faulty map sensor. Everyone suggests the sensor on the intercooler but the only map sensor I can see is on the intake manifold. Can anyone confirm it has more than one map sensor.