Toyota 89467-41011 Air Fuel Ratio Oxygen Sensor

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First off, all vehicles are equipped with On-Board Diagnostics II (OBD-II) engine management systems that include oxygen sensors and air/fuel sensors to verify the accuracy of the feedback loop between the oxygen sensor and the PCM. These sensors are placed before and after the catalytic converter to help control the efficiency of the converter. In fact, Camry models with four-cylinder engines have one oxygen sensor and one air/fuel sensor, while V6 engines have three sensors. Also, the main sensors are located in the exhaust manifolds, while the secondary sensor is placed after the catalytic converter. It is also important to note that the oxygen sensors monitor the oxygen in the exhaust stream to determine the air-to-fuel ratio, while the air/fuel sensors send feedback about alterations. Also, proper operating temperature, electrical connections, outside air supply, and use of unleaded fuel are important for the sensors. Finally, the silicone boot must be installed carefully to prevent damage and ensure proper function.

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.

Reconnect the electrical connector of the pigtail lead to the main wiring harness, lower the vehicle (if it was raised), test drive the car, and verify that no trouble codes have been set.

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.

All vehicles covered by this manual have On-Board Diagnostics-II (OBD-II) engine management systems, which can verify the accuracy of the feedback loop between the oxygen sensor and the PCM.