2011 bmw 135i high pressure fuel pump

changing hpfp. on a bmw 135i n55 easy job after you've done it once. first time it may seem steep but fairly easy. hpfp is mount by 3 mount bolts, 2 fuel lines, and 1 electrical connector. parts to remove are airbox and throttle body. signs of bad one are reduce power. use obd2 reader to get codes errors were fuel rail pressure too low. quotes $2500 to fix but DIY for $500 plus some tools a good socket set long reach hex bit metric drill torx set drill to socket adapter