P1133 Diagnostic Trouble Code Discussion for April 2016
Heated Oxygen Sensor (Bank 1 Sensor 1) Insufficient Switching
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| Help Request | Posted | |
| 1999 Chevrolet C2500 Suburban 7.4L Misfire, MIL Lamp on VIN: 1GNGK26J7X P1133: Heated Oxygen Sensor (Bank Sensor 1) Insufficient Switching. The misfire counter shows 1 miss on cyl 1, 2 misses on cyl4, then no miss at all. Rev a few times and get a miss on cyl 4. It is not consistently missing. I think the negative trim is from the slight occasional miss, allowing unburned fuel into the exhaust. Cl... |
April 20, 2016 | |
| 1999 Chevrolet C2500 Suburban 7.4L Misfire, MIL Lamp on VIN: 1GNGK26J7X P1133: Heated Oxygen Sensor (Bank Sensor 1) Insufficient Switching. The misfire counter shows 1 miss on cyl 1, 2 misses on cyl4, then no miss at all. Rev a few times and get a miss on cyl 4. It is not consistently missing. I think the negative trim is from the slight occasional miss, allowing unburned fuel into the exhaust. Cl... |
April 21, 2016 |
