P2626 HYUNDAI - HO2S Pumping Current Trim Circuit/Open Bank 1 Sensor 1
- HO2S Bank 1 Sensor 1 circuit poor electrical connection
- Faulty HO2S Bank 1 Sensor 1
If the same error code is set in the next driving cycle, the PCM illuminates the MIL.
The linear O2 sensor is mounted on the front side of the Catalytic Converter (warm-up catalytic converter) or in the front exhaust pipe. It detects a wide range of air/fuel ratios in the exhaust gas from the rich to lean regions. This linear O2 sensor produces a current that corresponds to a specific air/fuel ratio. The PCM monitors this signal and determines whether the air/fuel mixture is rich or lean. The PCM constantly monitors the linear O2 sensor and increases or decreases the fuel injection duration using this signal. This is called closed-loop fuel control operation.