P0134 Code: Meaning, Causes, and Symptoms | OBD2 Codes

P0134 – O2 Sensor Circuit No Activity Detected Sensor 1 Bank 1


P0134: DIY Repairing Video Tutorial


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P0134 Possible Symptoms

  Engine Light ON (or Service Engine Soon Warning Light),High Fuel Consumption,Excessive Smoke from Exhaust  

P0134 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  

P0134 Description

  The front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.