P0120 (blink 41) on Toyota Vitz (SCP10): Throttle position sensor circuit

Short answer: P0120 means “Throttle position sensor circuit”. The car’s computer has found a fault in the Engine - throttle system and turns on the Check engine light (MIL). First check: check sensor connector and wiring.

Code

P0120 · blink 41

System

Engine - throttle

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 · toyota-club.net

Likely causes

1. Open or short in throttle position sensor circuit
2. Throttle position sensor
3. Engine computer (ECM)

What to check, in order

1. Check sensor connector and wiring
2. Check sensor voltage while opening throttle slowly
3. Replace sensor if signal jumps or is out of range

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

• P0120 · Toyota Passo (1st gen)
• P0120 · Toyota Corolla (9th gen, E120)
• P0120 · Toyota Corolla (11th gen, E170)
• P0120 · Toyota Corolla (10th gen, E140)
• P0120 · Honda City (5th gen, GM2)
• P0120 · Honda Civic (10th gen, FC)
• P0120 · Suzuki Wagon R (Pakistan, K10B)
• P0120 on all cars compared

← P0116 P0121 →

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.