P0171 & P0174 Lean Codes
I struggled to resolve this on my 2003 Mazda MPV issue for over a year. I replaced PCV and hose, all o2 sensors, MAF sensor and still no relief. My regular mechanic and my shade tree mechanic were stumped. Then I took it to a reputable well known mechanic here in Arizona who ran an diagnostic test ($75) and pin pointed it immediately. Something I never would have checked (and quite frankly never heard of): It was the "Intake Runner Control Actuator Seal". Total cost for everything: $245.00. All is well now!
Last edited by azkev; 03-10-2012 at 08:23 PM.