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P1133 Diagnostic Trouble Code Discussion for February 2007

Heated Oxygen Sensor (Bank 1 Sensor 1) Insufficient Switching

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Trouble Ticket Help Requests for DTC P1133
Help Request Posted
2001 Subaru Outback 2.5L MIL Lamp on VIN: 4S3BH66571
P1133: Air Fuel Sensor (Bank 1 Sensor 1) Heater Circuit High Input. ... fuel circuit open and P1133 heater high input. We found no ground from ECU to sensor connector for the heater. O2 heater resistance tests good (we replaced sensor last March and again in December for code P1130). All wires from A/F sensors show continuity ...
February 14, 2007