Help With Cel

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got a code 54. My friend and I just put a JDM ITR swap in his gsr. The gsr had this sensor but the ITR motor does not. How can we bypass this? He is using a p73 ecu. thanks!
If the ECU that you are using is truly the ECU that came with that ITR engine them it shouldn't be looking for the sensor. What is code 54?