Rep Power: 0

Greetings my friends, surfed little bit through search, older topics, but couldn't find exact problem. My civic 7gen 2002 1,7 cdti is really hard to start after ~ 15 hours I mean cold. Battery isnt new, but often it need ~ 12 starter runs to grab it, and when the car start it burst out big white smoke cloud - after starting no more smoke. Spark plugs - changed. Fuel filter, air filter - changed, one week ago I chaged fuel filter it helped the problem for a while, but now it started again.

Diagnostics shows two foult codes :
P1236 - Fuel Pump Control out of range
P0238 - Turbo/Super charger Boost sensor "A" Circuit High

And plus this problems: my check engine light is coming out often if I put more than ~3k revs, stoping and starting engine puts me out of limp mode, and after one day the check engine light goes off until next heavier gas pedal. Any help? All tips appreciated guys, I still stay positive that I can solve this problem withouth mechanics