2000 Toyota 4Runner 3.4L Code P0171 (Bank 1 Systm. Too Lean). First time in shop found Calculated load at about 70% at 5kRPM WOT. Changed MAF and load was then at 95%. LTFT was 19.5% after new MAF was then 10%. Now customer is back 1 month later same code. Cac... Login to read more.