Oxygen Sensor Replacement

Here's how to diagnose and replace the oxygen sensor on a Toyota 2JZ-GE engine, found on a Lexus GS300 or IS300, Toyota Arista, Altezza and Crown. Often a check engine light illuminates with a code indicating a fault in the oxygen sensor. Oxygen sensors degrade over time and the heating circuit can break. This causes mis-reading in the oxygen content flowing through the catalytic converter by the ECU. As a result, the ECU does not know how to compensate fuel or air mixture for optimal combustion and

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