P0141 (blink 24) on Toyota Passo (KGC10): Rear O2 sensor heater circuit malfunction (EU spec)

Short answer: P0141 means “Rear O2 sensor heater circuit malfunction (EU spec)”. The car’s computer has found a fault in the Engine control (EFI) system and turns on the Check engine light (MIL). First check: unit check B8-221: rear O2 heater 13.0 ohm (+2.5/-1.3) @20C.

Code

P0141 · blink 24

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

Confidence

high (factory manual, export spec)

Source

carmanualsclub.com

Symptoms and when it is set

1. MIL per chart B8-52..55

Likely causes

1. Open/short in rear O2 heater circuit

What to check, in order

1. Unit check B8-221: rear O2 heater 13.0 ohm (+2.5/-1.3) @20C

Related on this car

• All fault codes for this car
• Warning lights
• Where the parts are (parts map)
• Common problems

Same code on other cars

• P0141 · Toyota Vitz (1st gen)
• P0141 · Toyota Corolla (9th gen, E120)
• P0141 · Toyota Corolla (11th gen, E170)
• P0141 · Toyota Corolla (10th gen, E140)
• P0141 · Honda City (5th gen, GM2)
• P0141 · Honda Civic (10th gen, FC)
• P0141 · Suzuki Wagon R (Pakistan, K10B)
• P0141 on all cars compared

← U1000/85 P0172/26 →

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.