fault codes

hi i have 2 fault codes found by a hand held that i am hoping someone can help me with.
hand held : p2040 check component b5/1 charge pressure sensor. signal voltage is too high..
2041/1 check component b40 oil sensor /oil level signal faulty
I have been having problems with oil level warning sign coming on saying oil level low when in fact it is ok

can any one tell what components they are and where the are in the engine

thanks

hugh