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P1133 Diagnostic Trouble Code Discussion for June 2007

Heated Oxygen Sensor (Bank 1 Sensor 1) Insufficient Switching


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Trouble Ticket Help Requests for DTC P1133
Help Request Posted
1996 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNDT13W3T
P1133: Heated Oxygen Sensor (Bank 1 Sensor 1) Insufficient Switching. Vehicle runs fine, no symptoms except that the MIL comes on with in one day of clearing the codes. I am leaning towards a fuel pressure problem, but would like a second opinion due to the expense of a regulator. Fuel pressure readings listed below in test sect...
June 14, 2007
1996 GMC C1500 Sierra SL 4.3L MIL Lamp on VIN: 1GTEC14WXT
P1133: Heated Oxygen Sensor (Bank 1 Sensor 1) Insufficient Switching. At present the issue is bank 1. Looking at mastertec waveform bank 2 is swinging fine- tho has had issues in the past. When a new AC Delco sensor is installed it also looks fine, but 100+ miles & it looks crappy again like something is killing the sensor/s...
June 22, 2007
1996 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNDT13W3T
P1133: Heated Oxygen Sensor (Bank 1 Sensor 1) Insufficient Switching. Vehicle runs fine, no symptoms except that the MIL comes on with in one day of clearing the codes. I am leaning towards a fuel pressure problem, but would like a second opinion due to the expense of a regulator. Fuel pressure readings listed below in test sect...
June 14, 2007
1996 GMC C1500 Sierra SL 4.3L MIL Lamp on VIN: 1GTEC14WXT
P1133: Heated Oxygen Sensor (Bank 1 Sensor 1) Insufficient Switching. At present the issue is bank 1. Looking at mastertec waveform bank 2 is swinging fine- tho has had issues in the past. When a new AC Delco sensor is installed it also looks fine, but 100+ miles & it looks crappy again like something is killing the sensor/s...
June 22, 2007