I've done a bit of searching around but could do with some confirmation before spending cash on parts

Code 23 = MAF sensor
Code 45 = Pressure Sensor

The car is a MY95 WRX that is currently using a manual boost controller rather than the 3 port controller as standard.

I have reset the ecu but the codes re appear.

The car can sometimes (nearly every time really) starts and runs very lumpy on start up until warm, the rad fans operate as they should only when hot.

I get no CEL whilst driving and have never seen it come on whilst the engine has been running.

When warm, the car runs fine and starts fine when hot as well.

Could it be that the MAF is **** but not give out a CEL whilst on the move?

Is the CEL code of 45 the solenoid valve or more specifically the MAP sensor?

Any help or pointers gratefully received

 

Anyone