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P1133 Diagnostic Trouble Code Discussion for November 2009

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 Excessive Emissions, Poor Idle Quality, Surge, MIL Lamp on VIN: 4S3BH67521
P1133: Air Fuel Sensor (Bank 1 Sensor 1) Heater Circuit High Input. This one came about a coolant leak on driver side engine head. Heads rebuilts with new exhaust valve guides, new gaskets, a well done job. First starting after repair engine run good. When get on the road vehicle run rough, and dont want a go over 2000 rpm... ...
November 07, 2009
1997 Pontiac Grand Prix GT 3.8L MIL Lamp on VIN: 1G2WP52K5V
P1133: Heated Oxygen Sensor (Bank 1 Sensor 1) Insufficient Switching. ... on front O2. Replaced O2 and code P1133-insuffiecent switching occured. Replaced O2 again, both times with OEM and code reappeared. Found no vacuum leaks, fuel pressure good. Watching O2 on graphing meter and at first it is switching, below 300 mv and abov...
November 08, 2009