P0171 · blink 25 – Fuel Trim System Too Lean (Air-Fuel Ratio Lean Malfunction,
- System
- Engine control (EFI)
- Dashboard light
- Check engine light (MIL)
- Check-engine blink code
- 25
- Applies to
- 1KR-FE: M300 (Sirion export = JDM Boon M300S/M301S(4WD? see gaps) & Passo KGC10/KGC15). JDM-spec ECU not separately documented | K3-VE: M301 (Sirion 1.3 = JDM Boon M310S? / Passo QNC10)
- Description
- Fuel Trim System Too Lean (Air-Fuel Ratio Lean Malfunction,
- Detection / symptoms
- Detection:
- Possible causes
- Trouble area: 1.Open wire or short circuit in the oxygen sensor circuit 2.Oxygen sensor 3.Engine coolant temperature sensor sensor 4.Evaporative emission purge VSV 5.EFI ECU
- What to check
- Checking points: 1.Is the fuel pressure normal? 2.Is the injector normal? 3.Is the oxygen sensor normal? Confirmation driving pattern (For EU specifications) Vehicle speed e 70 km/h w Idling IG SW OFF Time Warmed up C13E5564ES10; Unit check B8-218/223: fuel pressure 324+/-5 kPa; injector 12 ohm @20C, leak <=1 drop/min
- Confidence
- high (factory manual, export spec)
From the factory service material. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights