DTC P2251: O2 Sensor Reference Ground Circuit/Open (Bank 1 Sensor 1): ETM

Fig 1: Identifying PCM Connector Terminal Identification

Courtesy of KIA MOTORS AMERICA, INC.

Fig 2: Identifying ECM Connector Terminal Identification

Courtesy of KIA MOTORS AMERICA, INC.

For wiring diagram information, refer to appropriate SYSTEM WIRING DIAGRAMS article.