I have a 96 ford powerstroke I am working on ran a scan on it came up with code PO236 which is turbo boost sensor A circuit perf. what is this and where do i find this sensor at.

 

Look at the Map Sensor, and the hose leading to it for damage/leaks, and also the orange 'cross over hoses' on the intake.. Could be a bad sensor/hose, intake/boost leaks, circuit/pin issues, 'possibly' the turbo.. Take a look into the turbo 'inlet' at the compressor blades as well for damage.. If you have a gauge, check the boost pressure for a 'minimum' of 12PSI at the MAP connection on a road test/WOT...