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P0031 is Front oxygen sensor heater circuit low input . did you plug the oxygen sensor back in?
I think you are trying to put the resistor is the wrong plug. the plug you need to put the resistor in should only have to slots. the O2 sensor has 4 slots.
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Dom Tuned 2003 WRX Wagon
251.3 WHP
235.8 WTQ
If it's worth doing, it's worth overdoing
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