P0171 (blink 25) on Toyota Vitz (SCP10): Fuel mixture too lean
Short answer: P0171 means “Fuel mixture too lean”. The car’s computer has found a fault in the Engine - fuel system and turns on the Check engine light (MIL). First check: check for vacuum leaks and hoses.
- Code
- P0171 · blink 25
- System
- Engine - fuel
- 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
- Air leak in intake
- Blocked or leaking injector
- Low fuel pressure (pump, filter, regulator)
- Oxygen sensor
What to check, in order
- Check for vacuum leaks and hoses
- Check fuel pressure
- Check injectors
- Check oxygen sensor
Related on this car
- Lean code from an air leak (P0171)
- All fault codes for this car
- Warning lights
- Where the parts are (parts map)
- Common problems
Same code on other cars
- P0171 · Toyota Passo (1st gen)
- P0171 · Toyota Corolla (9th gen, E120)
- P0171 · Toyota Corolla (11th gen, E170)
- P0171 · Toyota Corolla (10th gen, E140)
- P0171 · Honda City (5th gen, GM2)
- P0171 · Honda Civic (10th gen, FC)
- P0171 · Suzuki Wagon R (Pakistan, K10B)
- P0171 on all cars compared
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.