Q: Both oxygen sensors are new and the one is still showing a P0135 code. on 1996 Lexus LX450

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The ECU was checked and is working properly. Where do I look next?
(1) Answer
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Either you have gotten a new sensor with a bad heater circuit or there is likely a wiring issue between the sensor and ECU. The ECU monitors the resistance in the heater circuit and if its out of range it sets that code for bank 1 sensor 1. Its looking for 11-16 ohms on that circuit.