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Home >> Kia >> 2021 >> Niro Plug-In Hybrid LXS >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis (PHEV) (2 Of 6) >> DTC P0171-00: System Too Lean (Bank 1) >> DTC Information >> DTC Detecting Condition
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DTC Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • Long term fuel trim deviation reached max limit (Too lean)
  • Poor connector connection
  • Air leakage or restriction in Intake or exhaust system
  • Dirty engine oil or oil Level too high
  • Faulty PCV
  • Faulty injector
  • Faulty fuel system
  • Faulty sensor signals
Enable Condition
  • Engine coolant temperature greater than 55°C (131°F)
  • Part load long term fuel trim active conditions
    • Engine speed is between 1150 to 4000rpm
    • Mass fuel flow is between 0.024 to 0.066g/rev
  • Estimated index of fuel dilution in oil counter for estimated fuel dilution in engine oil is less than 30 (For system too rich)
Threshold Value
  • long term fuel trim active conditions
  • long term fuel trim more than or equal to greater than 25%
Diagnostic Time
  • 90s
MIL ON Condition
  • 2 driving cycles