Toyota Corolla · Diagnostic Trouble Code
P0174 — System Too Lean (Bank 2)
Quick overview of P0174 on your Toyota Corolla. Read the full diagnosis guide, then find the repair guides for your vehicle below.
Repair guides that fix P0174
Toyota Corolla
2014-2019 Toyota Corolla — Fuel Pump Replacement
How to test fuel delivery when pressure is suspect.
Toyota Corolla
2014-2019 Toyota Corolla — PCV Valve Replacement
A stuck PCV valve is a classic lean-code cause.
Toyota Corolla
2014-2019 Toyota Corolla - Engine Air Filter Replacement
A restricted air filter can skew the air-fuel mixture.
Toyota Corolla
2014-2019 Toyota Corolla - Check Engine Light
What that light means and what to check first.
General diagnostic information, not a factory service procedure. If you're unsure, have a qualified technician confirm the diagnosis before buying parts.