PassoFix

P0135 (blink 23) on Toyota Passo (KGC10): Oxygen Sensor Heater Circuit Malfunction

Short answer: P0135 means “Oxygen Sensor Heater Circuit Malfunction”. The car’s computer has found a fault in the Engine control (EFI) system and turns on the Check engine light (MIL). First check: is the signal from the oxygen sensor inputted to the EFI ECU?.

Code
P0135 · blink 23
System
Engine control (EFI)
Dashboard light
Check engine light (MIL)
Also sold as
Daihatsu Boon, Daihatsu Sirion (M300)
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)
Confidence
high (factory manual, export spec)
Source
carmanualsclub.com

Symptoms and when it is set

  1. When an open wire or short is present in the oxygen sensor heater system

Likely causes

  1. Open wire or short circuit for the oxygen sensor heater circuit
  2. Oxygen sensor heater
  3. EFI ECU

What to check, in order

  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

Related on this car

Same code on other cars

← P0130/21 P0136/22 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.