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Branden Folkes Posted on Dec 14, 2013
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Check engine light is on and i got error code p1133. what is that?

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Ted Alvarez

Ted Alvarez

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  • Posted on Dec 14, 2013
Ted Alvarez
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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
its not always the sensor that is the problem, check connections, vaccum hoses. i would say most of the time the sensor is good, look it up just type you car and model and obd code on your browser.

Brock Saint Aoro

Brock Saint Aoro

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  • Expert 131 Answers
  • Posted on Dec 14, 2013
Brock Saint Aoro
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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

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.

If the Powertrain Control Module (PCM) determines that the front HO2S did not switch enough times, the PCM will set the P1133 code.

replace the o2 sensor

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