Mazda CX-5 · Diagnostic Trouble Code
P0171 — System Too Lean (Bank 1)
Quick overview of P0171 on your Mazda CX-5. Read the full diagnosis guide, then find the repair guides for your vehicle below.
Repair guides that fix P0171
Mazda CX-5
2017-2026 Mazda CX-5 — Fuel Pump Replacement
How to test fuel delivery when pressure is suspect.
Mazda CX-5
2017-2026 Mazda CX-5 - Engine Air Filter Replacement
A restricted air filter can skew the air-fuel mixture.
Mazda CX-5
2017-2026 Mazda CX-5 - 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.