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Home › Hyundai › 2018 › Sonata Plug-In Hybrid › Repair and Diagnosis › Engine Performance › System › Engine Control System Diagnosis (1 Of 3) (PHEV) › DTC P0135: O2 Sensor Heater Circuit (Bank 1/Sensor 1) › DTC Information › DTC Detecting Condition

DTC Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • Evaluate O2 sensor heater performance.
  1. Related fuse blown or missing
  2. Heater control circuit open or short
  3. Power supply circuit open or short
  4. Poor connection or damaged harness
  5. Faulty HO2S
Enable Conditions
  • The time of sensor heating is longer than 2 sec.
  • Battery voltage is between 11V and 16V.
Threshold Value
  • Front O2 sensor tip temperature is less than 670°C (1238°F)
Diagnostic Time
  • 20 sec.
Mil On Condition
  • 2 Driving Cycles
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