Oxygen Sensor Replacement

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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 may run lean dumping unburned fuel damaging the catalytic converter.

The oxygen sensor and catalytic converters are vital emissions components on a car. Failure to have them operational usually results in a failure of an emissions test.

Replacing an oxygen sensor can be easy, depending on its accessibility on the exhaust system and the presence of rust.

In this video, the replacement procedure is shown on a straight inline 6 Toyota 2JZ-GE engine, which luckily has its catalytic converter easily accessible from the side of the engine. A P0141 code meant the bank 1, sensor 2 O2 sensor, located after the catalytic converter was faulty.

Soak the oxygen sensor in penetrating oil to dissolve rust, then use a special sensor removal tool (22 mm for Japanese cars) and a breaker bar to turn it free.

During removal, the threads might become damaged or stripped out and may need to be cleaned up with a thread chaser or tap.

To test the old sensor, measure the resistance with a multimeter between the wires of two same color - black in this case - it should measure between 10-20ohms. A failed sensor will usually measure open circuit, meaning the heater circuit in the sensor is broken and it should be replaced.

An OEM replacement Denso 234-4626 sensor was used. Line the threads with anti-seize before installing and snug it down tight.

Procedure is generally the same for other vehicles once you locate and diagnose the faulty sensor.