Most of the atmospheric readings I see on the sensors are around the 1000 mb Mark ...it doesn't have to read excatly 1013mb just there abouts but be a steady reading at the same elevation .
If you go into the data blocks now after the boost pressure replacement what is your ignition on reading on the sensor that you say has some variation on .
Is the car in limp ? if it's still driveable , drive it and watch that reading have you got a reasonable bit of change when you go under some load .
So again ,...fixed value is atmospheric .....variable value is the actual boost pressure .
One step at a a time, don't get confused with other things ...air mass just measures air mass and air temp on most kinds of sensors .
If the boost pressure is showing the 1111.4 mb reading at ignition on that is enough to flag the incoherence code .
This is where we end up back at the boost pressure wiring checks if sensor supply voltage or earth is wrong so any signal outputs from that sensor will be wrong .
Is the replacement boost sensor you have a got a good make ? Not ting tong ?
Another test...... un plug the boost sensor then see what the default value is on the boost sensor data block .
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