Toyota RAV4 · Diagnostic Trouble Code
P0171 — System Too Lean (Bank 1)
Quick overview of P0171 on your Toyota RAV4. Read the full diagnosis guide, then find the repair guides for your vehicle below.
Repair guides that fix P0171
Toyota RAV4
2019-2025 Toyota RAV4 — MAF Sensor Replacement
Cleaning and replacing the MAF sensor.
Toyota RAV4
2019-2025 Toyota RAV4 — Fuel Pump Replacement
How to test fuel delivery when pressure is suspect.
Toyota RAV4
2019-2025 Toyota RAV4 — PCV Valve Replacement
A stuck PCV valve is a classic lean-code cause.
Toyota RAV4
2019-2025 Toyota RAV4 - Engine Air Filter Replacement
A restricted air filter can skew the air-fuel mixture.
General diagnostic information, not a factory service procedure. If you're unsure, have a qualified technician confirm the diagnosis before buying parts.