P1133 - HO2S Insufficient Switching Sensor 1

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?
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Possible causes
- 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
What does this mean? What does this mean?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1133 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.

P1133 Information for specific makes
P1133 ACURA HO2S Insufficient Switching Sensor 1
P1133 AUDI HO2S Heater Circuit- Bank 1 & 2 Sensor 1 Electrical Malfunction
P1133 BUICK HO2S Insufficient Switching Bank 1 Sensor 1
P1133 CADILLAC HO2S Insufficient Switching Bank 1 Sensor 1
P1133 CHEVROLET HO2S Insufficient Switching Bank 1 Sensor 1
P1133 DODGE ECT Sensor Circuit Interm Low Voltage
P1133 FORD Bank 1 Fuel Control Shifted Lean
P1133 GMC HO2S Insufficient Switching Bank 1 Sensor 1
P1133 HONDA HO2S Insufficient Switching Sensor 1
P1133 ISUZU H02S Insufficient Switching Bank 1 Sensor 1
P1133 LEXUS Air/Fuel Ratio Sensor Circuit Response Malfunction Bank 1 Sensor 1
P1133 LINCOLN Bank 1 Fuel Control Shifted Lean
P1133 MAZDA Bank 1 Fuel Control Shifted Lean
P1133 MERCURY Bank 1 Fuel Control Shifted Lean
P1133 PONTIAC HO2S Insufficient Switching Bank 1 Sensor 1
P1133 SATURN HO2S Insufficient Switching Bank 1 Sensor 1
P1133 SCION Air/Fuel Ratio Sensor Circuit Response Malfunction Bank 1 Sensor 1
P1133 SUBARU Front Oxygen Sensor Heater Circuit High Input
P1133 SUZUKI HO2S11 Too Few Transitions
P1133 TOYOTA Air/Fuel Ratio Sensor Circuit Response Malfunction Bank 1 Sensor 1
P1133 VOLKSWAGEN HO2S Heater Circuit- Bank 1 & 2 Sensor 1 Electrical Malfunction
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Repair Importance Level: 3
 
1=Low 2=Medium 3=High What does this mean?
Repair Difficulty Level: 2
 
1=Easy 2=Moderate 3=Hard What does this mean?
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