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P225A - NOX Sensor Calibration Memory (Bank 1 Sensor 1)

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
P225A - NOX SENSOR CALIBRATION MEMORY (BANK 1 SENSOR 1)

Description:  The PCM continuously monitors the controller area network (CAN) for messages from nitrogen oxide (NOx) module. This DTC sets when the PCM receives an incorrect calibration message from the NOx module.
Possible Causes: 
Diagnostic Aids:  Verify the NOx module is at the latest calibration level.
The presence of this DTC may indicate that the vehicle is operating in derate mode and may experience a loss of power.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST RD .