BMW camshaft timing problem

There was a problem in the car with camshaft timing so code was P0014 camshaft of exhaust over advanced.. We set the timing and the car was fine, but showed a code p0340 which says camshaft sensor, but I drive the car its was idle and no power worst then before brake was not working properly so I knew the there is a fault in camshaft timing I again. I opened the timing and saw that timing is out again, then again did the timing put the covers and oil and diagnosed it. It showed p0340 means camshaft sensor after that went for drive car was same like before no power and no gear shifting and idle and the diagnose the car p0011 code came means intake cam over advanced. I cannot under stand what to do please help!