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P1133 CHEVROLET - HO2S Insufficient Switching Bank 1 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?

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.

Possible symptoms

  • 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.
OBDII Code P1133 Chevrolet - HO2S Insufficient Switching Bank 1 Sensor 1 -

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P1133 CHEVROLET Comments

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Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 2
1=Easy 2=Moderate 3=Hard

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Posted and Edit by 04-28-2016

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