P2238 Code: Meaning, Causes, and Symptoms | OBD2 Codes

P2238 – O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 1


P2238: DIY Repairing Video Tutorial


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P2238 Possible Symptoms

  Engine Light ON (or Service Engine Soon Warning Light)  

P2238 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  

P2238 Description

  The Front Oxygen Sensor (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.