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Home >> Kia >> 2018 >> Optima EX >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis - 2.4L (1 Of 3) (Except HEV) >> DTC P0140-00: O2 Sensor Circuit No Activity Detected (Bank 1/Sensor 2) >> DTC Information >> DTC Detecting Condition
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DTC Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • Signal plausibility with lean mixture (During fuel cut off)
  1. Poor Connector Connection
  2. Faulty Downstream O2 Sensor
Enable Conditions
  • Downstream O2 sensor operative readiness detected (sensor element resistance lower than 1kΩ or heater max heating or normal heating for higher than 75s.)
  • Integrated mass air flow since last fuel cut off higher than 500g
  • Integrated mass air flow since fuel cut off begin higher than 12g and lower than 250g
  • Battery voltage higher than 11V and lower than 16V
  • No relevant DTC present
Threshold Value
  • Downstream O2 sensor voltage higher than 0.2V
Diagnostic Time
  • 5s.
Mil On Condition
  • 2 Driving cycles