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I have 2007 GMC Truck 5.3L SLT. Truck runs great just got this code p2a01

Vehicle: 2007 GMC Truck 5.3L SLT

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Best answer
You must replace the front O2 Sensor Bank 1 (Air/Fuel Ratio Sensor Bank 1) to fix the problem. Before replacing the sensor, make sure there are no intake or exhaust leaks.
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P2a01 is a dtc code. 

P2a01- A circuit/performance range problem with an oxygen sensor, bank 2 sensor one

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