DTC P2251-00: Open Circuit Between A/F Sensor Terminal D And Pcm Terminal 1S (Us): Notes
WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- To determine the malfunctioning part, proceed with the diagnostics from "Function Inspection Using M-MDS".