Acura 36531-P75-A01 Oxygen Sensor

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The oxygen sensor, located in the exhaust manifold, monitors the oxygen content of the exhaust gas stream, producing a voltage output that varies from 0.1 volts (indicating a high oxygen, lean mixture) to 0.9 volts (indicating a low oxygen, rich mixture). The PCM continuously monitors this voltage to determine the oxygen-to-fuel ratio, adjusting the air/fuel mixture by controlling the pulse width of the fuel injectors, aiming for an ideal ratio of 14.7 parts air to 1 part fuel to minimize emissions and optimize catalytic converter efficiency. In 1996 and later models, two oxygen sensors are utilized; the primary sensor is positioned before or within the catalytic converter, while the secondary sensor is located after it, serving to monitor catalytic converter efficiency without influencing the air/fuel mixture. The oxygen sensor requires specific conditions for proper operation, including clean electrical connections, unrestricted air supply, appropriate operating temperature of around 600 degrees F, and the use of unleaded fuel. Special care is necessary during servicing to avoid damaging the sensor or its connections. Testing involves monitoring the voltage signal as the engine warms, with a healthy sensor fluctuating between 0.1 and 0.9 volts in closed loop mode, while the secondary sensor should stabilize around 0.3 to 0.6 volts. The heater's functionality can be checked with an ohmmeter, and proper supply voltage should be verified. If any tests indicate failure, the sensor should be replaced. When replacing the sensor, it is advisable to warm the engine to ease removal, disconnect the battery, and ensure the use of anti-seize compound on the threads to facilitate future removal. After installation, the electrical connector should be reattached, and a test drive should confirm that no trouble codes are present.