Anyone have this code (PO171) System too lean bank 1? It comes on once every now and then. I have intake and induction pipe, ur test pipe and HKS catback with a custom flash for mod. I keep getting the P0171 code. Anyone have a idea what cause it or any fix for it? BTW, the car is quite rich when I had it tune, A/F is around 11.1. The car drive perfectly normal but the service light is just so annoying.

 

closed loop tuning is too lean... most likely due to the intake and induction pipe, these can cause MAF readings to be off... which causes the fueling to be incorrect (usually lean as the cone filter directly to the MAF registers less voltage for more air)

the solution is get the 'tuner' to reflash