2003 BMW 325i Q&A

2003 BMW 325i Question: what is woung with when engine is getting to much air and not enouth fuel?

codes p0171 and p0174 what should i do to fix this problem? -
Answer 1
vac leak or poss mass air flow sensor -
Comment 1
what do you mean by vac leak and could to damage my engine if i use it? -