LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Hyundai >> 2021 >> Accent Limited >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis (6 Of 6) >> DTC P2251-00: O2 Sensor Reference Ground Circuit/Open (Bank 1 Sensor 1) >> Wiring Inspection >> Circuit Inspection
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit Inspection

Item Normal value Prerequisite condition (+) Probe (-) Probe
Virtual Ground Circuit: Resistance (Open) Below 1Ω
  1. Ignition switch: OFF
  2. Sensor, ECM connector: Disconnected
Virtual Ground Terminal (HO2S (S1) connector) Virtual Ground Terminal (ECM connector)
  1. Is the result within specifications?

YES 

NO