My engie light came on monday morning on my way to work. Everything seamed like it was all working fine no hesitation or stumbling or rought idle. Had the guys at Discount auto parts pull the codes for me with there reader and we got a P0171 - System lean. Wound a leaking Brake booster make this code come up? I know mine is leaking cause I can hear a leak when I step on hte Brake pedal now as well.