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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 67 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1131, DTC P1151, DTC P2195, DTC P2196, DTC P2197 Or DTC P2198 >> Detection Condition

Detection Condition

WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P1131, P2195, P2196 (Bank 1) and DTCs P1151, P2197, P2198 (Bank 2) indicates HO2S is indicating lean at the end of a test trying to correct for over-rich conditions. The test fails when fuel control system no longer detects a switch for a calibrated amount of time. 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 of 14.7:1 during closed loop engine operation.

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