2002 S80 T6 codes P0235 & P0236

[nyc1836]

I have 2002 VOLVO S80 T6 CODES P0235 & P0236
I get codes p0235 and p0236 could anyone please tell me which sensors to check I know it is a boost circuit problem.I did some research volvo told me there is a solneiod valve part# 9473212 which some call boost presure valve and also map sensor part#9125462.I also disconnected map sensor and drove car.Codes p0236 and p0238 came up.Any advice please of which sensor to change first.if its any of these two.I know i might have to change both to find the one that is bad.I also read something about map sensor.Ok I had found the presure boost valve sensor already and disconnected that only I get codes P0236 AND P0243
Just a recap when everything connected I get codes p0235&p0236. When I disconect map sensor only I get codes p0236&p0238 I reset
When I disconnected presure sensor valve only I get codes p0236&p0243
Thanks in advance for any help
Elliot

[syrotchen]

Boost pressure sensor, located on the air intake between the intercooler and the throttle body. May want to check for air leaks, or a hose that has come loose. In my case the plastic intake tube was not seated all the way on the throttle body inlet. My understanding is the boost pressure sensor is a common failure as is the Turbo control valve.