Code p 1031 refers to heated oxygen sensor(HO2S) bank 1--heater --voltage low===causes --wiring---HO2S
code p 1148 refers to closed loop control--bank 1- inoperative === causes ---wiring---HO2S--- ECM
I am think that you haven't connected the harness up properly
or damaged the wires to the HO2S when disconnecting the harness
SOURCE: WHAT is p1148 code and P1031 code for Nissan sentra 2005?
Wow, looks like I have answered a question like this back on July 26th.
Code 1148 and 1031 are both for the O2 sensor in front of the catalytic converter. The sensor would need to be tested with a scanner and a multi-meter.
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