Toyota 89467-41011 Air Fuel Ratio Oxygen Sensor

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Oxygen sensors and air/fuel sensors have different operating characteristics. Oxygen sensors are galvanic batteries that react to the oxygen content in the exhaust stream to produce a voltage output that the PCM monitors to determine the ratio of oxygen to fuel in the mixture and make the necessary correction. Air/fuel (A/F) sensors provide a variable voltage output to the PCM that's proportional to the air/fuel mixture ratio in the exhaust stream.

The air/fuel sensor cannot be checked for voltage without a special tool, but the resistance of the heating element can be checked with an ohmmeter.

The air/fuel sensor cannot be checked for voltage without a special tool, but the resistance of the heating element can be checked with an ohmmeter.

All vehicles are equipped with On-Board Diagnostics II (OBD-II) engine management systems, which include the ability to verify the accuracy of the feedback loop between the oxygen sensor and the PCM. This is accomplished through the use of an oxygen sensor or air/fuel sensor located before and after the catalytic converter. By sampling the exhaust gas, the PCM can determine the efficiency of the converter and predict potential failures. Camry models with four-cylinder engines have one oxygen sensor and one air/fuel sensor, while V6 engines have three sensors. The primary sensors are located in the exhaust manifolds, and the secondary sensor is positioned after the catalytic converter. Oxygen sensors operate based on the oxygen content in the exhaust stream, producing a voltage output that the PCM monitors to determine the air-to-fuel ratio. Oxygen sensors require proper operating temperature, electrical connections, outside air supply, and the use of unleaded fuel. A diagnostic trouble code is set if the oxygen sensor produces a steady voltage below the specified threshold. Air/fuel sensors, on the other hand, provide feedback to the PCM about the alterations it makes to injector pulse width. Their voltage output is proportional to the air/fuel mixture ratio in the exhaust stream, but they do not switch back and forth like oxygen sensors. Special precautions must be taken when servicing sensors to avoid damage and ensure proper operation. Cleaning solvents should not be used, and the silicone boot must be installed correctly.