Code P0133 HO2S1 Nissan Dualis, Qashqai HR16DE

The heated oxygen sensor 1 is placed into the exhaust manifold. Itdetects the amount of oxygen in the exhaust gas compared to theoutside air. The heated oxygen sensor 1 has a closed-end tubemade of ceramic zirconia. The zirconia generates voltage fromapproximately 1V in richer conditions to 0V in leaner conditions. Theheated oxygen sensor 1 signal is sent to the ECM. The ECM adjuststhe injection pulse duration to achieve the ideal air-fuel ratio. Theideal air-fuel ratio occurs near the radical change from 1V to 0V

DTC DETECTION LOGIC To judge the malfunction of heated oxygen sensor 1, this diagnosismeasures response time of heated oxygen sensor 1 signal. The timeis compensated by engine operating (speed and load), fuel feedbackcontrol constant, and heated oxygen sensor 1 temperature index.Judgment is based on whether the compensated time (heated oxygen sensor 1 cycling time index) is inordinately long or not