i had not gotten any problem when unplugging the battery without saving the memory. You can find the steps to activate your monitors on a online search. I just run my vehicle until all the "monitors" become active and i'm good to go.

Oh yea, there is ways to save the memory if the relearning procedure is a problem. I just can't remember them on top of my head right now

I sure do hate those check engine light problems. Its so time consuming just to figure out the cause of the problem. Try this link www.obd-codes.com/p0171 for that particular code. I often look up the codes on this site and I found it very useful on figuring out the solution to my problem. You can find "possible solution" if you scroll down to the mid of the page. Not all solution are listed here so you might have to do more research if the "possible solution" did not resolve your problem.

if you go to autozone o reileys they will know just tell them its for lancer

Group 35