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Detection Condition

WARNING: This page is about a different car, the 2002 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.

DTC P1130 indicates HO2S-11 (Bank 1) fails to switch due to circuit or fuel at or exceeding a calibrated limit.

DTC P1150 indicates HO2S-21 (Bank 2) fails to switch due to circuit or fuel at or exceeding a calibrated limit.

HO2S detects presence of oxygen in exhaust and produces a variable voltage according to the amount of oxygen detected. A high concentration of oxygen in the exhaust produces a low voltage signal (less than 0.4 volt). A low concentration of oxygen in the exhaust produces a high voltage signal (more than 0.6 volt). HO2S provides feedback to PCM indicating air/fuel ratio in order to achieve near stoichiometric air/fuel ratio during closed loop engine operation.

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