P0134 Code - O2 Sensor Circuit No Activity Detected Sensor 1 Bank 1

Discussion in 'P - Powetrain Codes' started by fault code, Dec 9, 2017.

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    fault code Administrator Staff Member

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    What Does P0134 Mean?

    Code P0134 is triggered when the powertrain control module or PCM determines that the oxygen sensor voltage is hovering around 450 millivolts. This value varies with each vehicle, however a conventional oxygen sensor needs to continuously switch above and below 450 millivolts.

    The purpose of the oxygen sensor is to measure the oxygen content in the exhaust gases after they leave the combustion process of the engine. This data is vital in order for the engine to produce the best power while at the same time, emitting the lowest possible amount of air pollution. If there is too little oxygen in the exhaust, it means the engine is running too rich and using excessive fuel. This not only wastes fuel, it pollutes the air with carbon monoxide. When this occurs, the Power Train Control Module or PCM will cut back on the amount of fuel it delivers to the engine. If there is too much oxygen in the exhaust, this means that the engine is running too lean and is polluting the air with poisonous nitrogen oxides and raw hydrocarbons. When this occurs, the PCM will increase the amount of fuel delivered to the engine.

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    What are the common causes of P0134 ?
    • An air leak forward of the DPF will change the sensor readings resulting in the code
    • Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
    • Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
    What are the symptoms of P0134 ?

    These could include a lean or rich condition in the engine, decreased fuel efficiency, black smoke from the tailpipe, and an illuminated service engine soon lamp.

    How do you troubleshoot P0134 ?
    • The technician should use a scanner to validate the fault code. After the fault code has been validated, it should be reset and a test drive should be performed. If the Check Engine Light returns with the same fault code, an inspection should follow.
    • The wires and connectors should be inspected for any damage. If the wires and connectors are damaged, they should be repaired or replaced. Reset fault code and test drive.
    • If the Check Engine Light comes on again and the technician gets the same code, the oxygen sensor will need to be replaced.
    • If the P0134 trouble code comes back after replacing the oxygen sensor, the exhaust pipe and heater fuse should be inspected to rule out possible damage of the two.
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