He guys having a wierd lean issue. Scan tool with car off shows both o2 sensors functioning properly (by voltage) while cars running o2b1s1's voltage will sit at idle 0.000-0.005 while o2b1s2 will sit 0.415. Through a raise in rpm o2b1's voltage will not change higher then .0015. Osb2 will change with throttle. Car was having a idle issue and 99% of it was cleared up with a new maf. New wires, plugs, ignition coils. Rpm at idle is holding 706-710rpm theres no loss in power and she runs through that rpm band really smooth down the road. Current temp outside is 59degree. And all other live data shows good running condition. Is there any suggestions on why os in bank 1 is showing lean and should i be conserned? I can give more info if needed.