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P0134 Chevrolet

P0134 Chevrolet - HO2S Circuit Insufficient Activity Bank 1 Sensor 1

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P0134 Chevrolet Comments |  Add Comment
Possible causes
- Faulty Front Heated Oxygen Sensor Bank 1
- Front Heated Oxygen Sensor Bank 1 harness is open or shorted
- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks
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Tech notes
Replacing the Front Heated Oxygen Sensor Bank 1 usually takes care of the problem.
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When is the code detected?
The Powertrain Control Module (PCM) monitors the HO2S voltage and detects if the voltage goes out of the bias range. If the PCM does not detect the voltage went out of the bias range, the P0134 code will set.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- High Fuel Consumption
- Excessive Smoke from Exhaust
P0134 Chevrolet Description

The Powertrain Control Module (PCM) supplies a voltage of about 450 mV between the HO2S high and low signal circuits. The oxygen sensor varies the voltage over a range from about 1,000 mV when the exhaust is rich, down through about 10 mV when the exhaust is lean.

The PCM monitors and stores the heated oxygen sensor (HO2S) voltage information. The PCM evaluates the HO2S voltage samples in order to determine the amount of time the HO2S voltage was out of range. The PCM compares the stored HO2S voltage samples taken within each sample period and determines if majority of the samples are out of the operating range.

CHEVROLET Technical Service Bulletins for P0134 code
2002 CHEVROLET CAVALIER Electrical System Details
2002 CHEVROLET CAVALIER 110000 Electrical System Details
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