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P1130 Diagnostic Trouble Code Discussion for January 2010

Heated Oxygen Sensor (HO2S-12/HO2S-13) Signal Circuit Demand Changing

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Trouble Ticket Help Requests for DTC P1130
Help Request Posted
2001 Toyota Highlander 3.0L Excessive Emissions, Misfire VIN: JTEHF21A91
P1130: Air Fuel Ratio Sensor (Bank 1 Sensor 1) Circuit Malfunction. I've dealt with this code on Toyotas before, this engine utilizes air/fuel sensors, not o2 sensors, but what puzzles me is why the lean codes when the engine is obviously running rich? I mean it has black sooty plugs that were replaced a week ago and already h...
January 06, 2010