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it looks like this is pretty common on a jdm swap where your using usdm and jdm componets the usdm uses a 4 wire heated o2 sensor and the jdm one uses a 1 wire non heated so the basic fix is have matching engine harnesses and ecu's if your useing a jdm harness and ecu get the universal 1 wire if your using a usdm harness and ecu get the 4 wire.
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