P0172 · blink 26 – Fuel trim system too rich (2-trip)

System: Engine control (EFI)
Dashboard light: Check engine light (MIL)
Check-engine blink code: 26
Applies to: 1KR-FE: M300 (Sirion export = JDM Boon M300S/M301S(4WD? see gaps) & Passo KGC10/KGC15). JDM-spec ECU not separately documented
Description: Fuel trim system too rich (2-trip)
Detection / symptoms: MIL per chart B8-52..55
Possible causes: Abnormal combustion pressure, injector or O2 sensor
What to check: Unit check B8-218/223: fuel pressure 324+/-5 kPa; injector 12 ohm, 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