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Home >> Kia >> 2017 >> Rio SX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (3 Of 3) >> DTC P2251: O2 Sensor Reference Ground Circuit/Open (Bank 1 / Sensor 1) >> General Information >> DTC Description

DTC Description

ECM assumes the ground circuit is open and shows P2251 when upstream O2 sensor is 1.49 ~ 1.53V and internal resistance gets high.

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