DTC U0121 Hyundai

O2S Sensor Positive Current Control Circuit Open Circuit (Bank 2 Sensor 1)

O2S Sensor Positive Current Control Circuit Open Circuit (Bank 2 Sensor 1)

Description

Engine started, the fault criterion must remain present for over 2 seconds, the Lambda specification is outside three percent relative to Lambda = 1, and the closed loop lambda control is active.

Cause and Solution

Check plugsCheck wiring harnessReplace sensor

Video Guide

Duration: PT4M2S | Uploaded: 2020-06-21

Diagnostic Info

  • DTC Code: U0121
  • Brand: Hyundai
Back to Blog