P0130 · blink 21 – Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 1)

System: Engine control (EFI)
Dashboard light: Check engine light (MIL)
Check-engine blink code: 21
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: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 1)
Detection / symptoms: Detection: 1.When no rich signal is sent even once from the oxygen sensor even if the condition continues in which the engine revolution speed is more than 3000 rpm and the power increase compensation is contin- ued over the specified value after the engine warming-up
Possible causes: Trouble area: 1.Air induction system 2.Fuel pressure 3.Injector 4.Open wire or short circuit in the oxygen sensor circuit 5.Oxygen sensor 6.EFI ECU
What to check: Checking points: NOTE • When this code is outputted concurrently with another code, carry out the check for that code first. 1.Is the signal from the oxygen sensor inputted to the EFI ECU? 2.Is the harness between the oxygen sensor and the EFI ECU normal? 3.Is the output of the oxygen sensor correct? (If there are n; Unit check B8-220: front O2 heater OXH1-+B 7.0 ohm (+1.4/-0.7) @20C; no continuity body-terminals
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