Mad MAF readings on 2009 V70 2.4D

[shadycat]

Hi all, my 2009 V70 2.4D is showing some odd readings from the MAF, way to high. I replaced it and the results are the same, I suspect a leak somewhere as swirl actuator is fine and attached ok.

I also noticed that if I activate the EGR in Vida, the MAF readings drop significantly:

With EGR running normally at < 10%:

V70 (0,2009,D5244T5,MMT6,YV1BW694191094274
Parameter Value
ECM-Air Flow Rate from Mass Air Flow Sensor 49,39 kg/h
ECM-Swirl actuator position 46,11 %
ECM-Air mass desired 237,7 mg/s
ECM-Air mass/stroke 480,3 mg/s
ECM-Intake air temperature (MAF) 81,86 °C
ECM-Intake air temperature (TMAP) 24 °C

With EGR activated to 100% in Vida:

V70 (0,2009,D5244T5,MMT6,YV1BW694191094274
Parameter Value
ECM-Air Flow Rate from Mass Air Flow Sensor 19,69 kg/h
ECM-Swirl actuator position 46,11 %
ECM-Air mass desired 237,8 mg/s
ECM-Air mass/stroke 188,4 mg/s
ECM-Intake air temperature (MAF) 81,86 °C
ECM-Intake air temperature (TMAP) 25 °C

As you can see the Air flow rate drops significantly.

This also seems related to the soot level in the DPF. The reason I say this is that after a regeneration, its ok until the soot gets to a couple of grams, then every time it boosts, the soot level rises massively but drops down again when it drops to idle.

If I thrash it and the soot level gets to over 25, it starts a regen even though I know there was barely any in it as it regenned only a few hours before.

Could a leak be the cause of all this? Or could it be a faulty EGR? I had the throttle body and EGR cleaned out a year ago so not thinking its that.

Also is that IAT MAF reading right? Seems way too high.

Any help or advice much appreciated.