P1133 Chevrolet - HO2S Insufficient Switching Bank 1 Sensor 1
- Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
- Vacuum leak
- Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 harness is open or shorted
- Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 circuit poor electrical connection
When is the code detected?
If the Powertrain Control Module (PCM) determines that the front HO2S did not switch enough times, the PCM will set the P1133 code.
- Engine Light ON (or Service Engine Soon Warning Light)
P1133 Chevrolet Description
The Powertrain Control Module (PCM) monitors the Heated Oxygen Sensor (HO2S) activity for 90 seconds after closed loop operation has begun. The PCM determines if the front HO2S is functioning properly by counting the number of HO2S-1 Lean/Rich (L/R) and Rich/Lean (R/L) switches.
CHEVROLET Technical Service Bulletins for P1133 code
2007 CHEVROLET COBALT Fuel System, Gasoline:delivery:fuel Pump Details
2007 CHEVROLET COBALT 072100 Fuel System, Gasoline:delivery:fuel Pump Details
2007 CHEVROLET COBALT Engine And Engine Cooling:engine Details
2007 CHEVROLET COBALT 061000 Engine And Engine Cooling:engine Details
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