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P0136 decrease to less than b. HO2 sensor voltage does not increase to Low impedance: Sensor impedance less than 5 HO2 sensor heater (for Bank Air-fuel Ratio (A/F) sensor Integration relay Gas leakage from exhaust P0137 Low voltage (open): During active air-fuel ratio a. HO2 sensor voltage output less than 0.21 V b. Target air-fuel ratio rich High impedance: Sensor impedance 15 kohms Open in HO2 sensor (for HO2 sensor (for Bank 1, 2) HO2 sensor heater (for Bank Integration relay Gas leakage from exhaust P0138 High voltage (short): During active air-fuel ratio a. HO2 sensor voltage output more than 0.59 Short in HO2 sensor (for HO2 sensor (for Bank 1, 2) ECM internal circuit
2009 Toyota Tundra 2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra
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