Code 331 means the steering pot is opened or is shorted. I would enter the analyzer menu A2.2.8 and look at the display as you turn the wheel. Left is -90, 0 is center, 90 is right. If the numbers smoothly move up or down and don't jump, try recalibrating pot1 in the calibration menu (c3). If the numbers do jump around I have a few wire connections you can test voltages at.
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