Codes P0140 and P0171, engine lamp is ON. on 2011 Mazda Mazda2

My Mazda 2 2011 (skyactive, istop) is showing fault codes P0140 and P0171 when diagnosed. P0140 - O2 Sensor Circuit No activity detected( Bank 1 sensor 2) P0171 - System too Lean (Bank 1)

by in Clinton, IA on June 03, 2013
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1 answer
ANSWER by , June 03, 2013
should be under dealer warranty