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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0131 Or DTC P0151 >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.

HO2S detects oxygen in the exhaust and produces a variable voltage according to the amount of oxygen detected. A high concentration of oxygen in the exhaust causes HO2S to produce a low voltage signal (less than 0.4 volt). A low concentration of oxygen in the exhaust causes HO2S to produce 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. Possible causes are:

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