Toyota 4 Wire O2 Sensor Wiring Diagram

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# Toyota 4 Wire O2 Sensor Wiring Diagram

The Toyota 4 wire O2 sensor is a sensor that measures the oxygen content in the exhaust gas. It is used to help the engine control module (ECM) adjust the air/fuel mixture to optimize fuel efficiency and emissions. The 4 wire O2 sensor has a heated element that helps to improve the sensor's performance at cold temperatures.

The Toyota 4 wire O2 sensor wiring diagram is shown below. The sensor is connected to the ECM by a 4-wire connector. The red wire is the power supply, the black wire is the ground, the green wire is the signal wire, and the white wire is the heater circuit.

Toyota 4 wire O2 sensor wiring diagram

The oxygen sensor is located in the exhaust manifold downstream of the catalytic converter. The sensor measures the oxygen content in the exhaust gas and sends a signal to the ECM. The ECM uses this signal to adjust the air/fuel mixture to maintain the desired oxygen level in the exhaust gas.

The Toyota 4 wire O2 sensor is an important part of the engine management system. It helps to improve fuel efficiency and emissions. If the sensor is faulty, the ECM may not be able to adjust the air/fuel mixture properly, which can lead to decreased fuel economy and increased emissions.

If you suspect that your Toyota 4 wire O2 sensor is faulty, you should have it tested by a qualified mechanic.

### References * [Toyota 4 wire O2 sensor wiring diagram](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Toyota_4_wire_O2_sensor_wiring_diagram.svg/220px-Toyota_4_wire_O2_sensor_wiring_diagram.svg.png)


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