Fuel pressure sensor

Hi got a problem with wife's K12 DCI. Been told that it's possibly the fuel pressure sensor that needs replacing is this a costly part and labour
Thanks
 
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Hi got a diagnostics test done came up with fuel starvation. Been told possibly fuel sensor, fuel pump or injectors as possible fault but can't be pinpointed.
Read a thread that k12s suffer with weak throttle bodies which can give you lack of power is this a possibility. What I can't get my head around is that this problem only occurs when it seems that something relating to the car has warmed up. Went out in the car at about 11.00pm and the problem seemed to take longer than normal as it was a colder night. Can't seem to find anyone who can say that yes that exact problem happened to me and it's this what's gone wrong. It's only an 05 plate and it's not worth throwing money at it trying different things if a diagnostic machine can't pinpoint it to one thing
 
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