p0171
Moderate
Infiniti · Sedans
System Too Lean (Bank 1)
Quick Answer
Error code P0171 on your Infiniti Sedans means: System Too Lean (Bank 1). This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Connect OBD-II scanner to diagnose
2
Check oxygen sensor voltage with multimeter
3
Inspect for vacuum leaks using smoke test
4
Clean or replace fuel injectors
5
Test fuel pressure at fuel rail
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Oxygen sensor
Fuel injector cleaner
Fuel filter
Vacuum hose
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