P0135 on Toyota Vitz (SCP10): Front oxygen sensor heater circuit

Short answer: P0135 means “Front oxygen sensor heater circuit”. The car’s computer has found a fault in the Engine - O2 system and turns on the Check engine light (MIL). First check: check heater fuse and wiring.

Code

P0135

System

Engine - O2

Dashboard light

Check engine light (MIL)

Also sold as

Toyota Yaris, Toyota Echo (XP10)

Applies to

1SZ-FE (by platform)

Confidence

medium (Toyota Echo 1999–2002 factory diagnostics, same XP10 platform; not confirmed on JDM 1SZ-FE)

Source

carmanualsclub.com

Likely causes

1. Open or short in oxygen sensor heater circuit
2. Oxygen sensor heater
3. Engine computer (ECM)

What to check, in order

1. Check heater fuse and wiring
2. Check heater resistance
3. Replace sensor if heater is open

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

• P0135 · Toyota Passo (1st gen)
• P0135 · Toyota Corolla (9th gen, E120)
• P0135 · Toyota Corolla (11th gen, E170)
• P0135 · Toyota Corolla (10th gen, E140)
• P0135 · Honda City (5th gen, GM2)
• P0135 · Honda Civic (10th gen, FC)
• P0135 · Suzuki Wagon R (Pakistan, K10B)
• P0135 on all cars compared

← P0133 P0136 →

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.