DTC P0133: Ho2S Circuit Slow Response (Bank 1/Sensor 1): DTC Detecting Condition

2005 Hyundai Santa Fe GLS, 2.7 D, AWDSECTION DTC Detecting Condition
DTC DETECTING CONDITION CHART

Item Detecting Condition Possible Cause
DTC Strategy
  • Comparison of O2 sensor lean/rich period with calculated period
  • Leak in intake or exhaust system
  • Faulty fuel system.
  • Front and rear HO2S connections reversed.
  • Contact resistance in connectors
  • HO2S contamination
Enable Conditions
  • 400°C (752°F) > Catalyst Temp.Model > 900°C (1652°F)
  • Coolant temp. < 70°C (158°F)
  • 1200 > Engine speed (RPM) > 3000
  • 300 > Mass air flow (mg/rev.) > 840
  • No misfire detected
  • Not transient condition
Threshold Value
  • Sum of O2 sensor lean/rich period < calculated period
Diagnostic Time
  • 70 lambda controller cycles
MIL On Condition
  • 2 Driving Cycles
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.