Code p1148 and p1031
SOURCE: P1148 P1031 P1279 P0420
Well looks like all 4 codes point to the O2 sensor bank one sensor one.
Code 1148 and 1279 are for problems with the performance of the sensor, code 1031 is for a problem with the heater in the sensor, and code 420 is for poor performance of the catalytic converter on bank one which could also be the sensor.
I would probably replace the sensor or switch it with the one on bank two and see if the codes change.
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