BMW Repair: code, vacuum hoses, vacuum leak

Question
check engine light is on comes up p1174 what does it mean and how to fix it on 1997 bmw 318ti

Answer
It's for a "Manufactured controlled fuel and metering".

Most likely problems are the O2 sensor, MAF, or a vacuum leak.

First I'd check for a vacuum leak.  Look for cracked or damaged or loose vacuum hoses in the system.  Second, I'd check the air hose between the MAF and the air manifold.  A leak in this could cause the problem.