p0171
Moderate
Honda · SUVs
System Too Lean Bank 1
Quick Answer
Error code P0171 on your Honda SUVs means: System Too Lean Bank 1. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
RW1RW3RW5RV1CR-V EX 2024CR-V EX-L 2024CR-V Hybrid Sport 2024CR-V Hybrid Sport Touring 2024CR-V Hybrid Sport-L 2024CR-V LX 2024CR-V Sport 2024CR-V Sport Touring 2024HR-V EX-L 2024HR-V LX 2024HR-V Sport 2024Passport EX-L 2024Passport Sport 2024Passport Touring 2024Passport TrailSport 2024Pilot EX 2024Pilot EX-L 2024Pilot Elite 2024Pilot LX 2024Pilot Touring 2024Pilot TrailSport 2024YG7YA7ZD1RZ1
Likely Causes
How to Fix It
1
Perform a smoke test to identify vacuum leaks in the intake system and around the throttle body
2
Clean the MAF sensor with MAF-specific cleaner; replace if readings remain out of specification on scan tool live data
3
Check fuel pressure at the fuel rail with a gauge; compare to Honda service manual specifications for the specific engine
4
Inspect and clean fuel injectors; replace any injectors with poor spray pattern or low flow
5
Verify all vacuum lines are intact and properly connected, especially the large brake booster hose
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
Intake manifold gasket
Throttle body gasket
MAF sensor
Fuel filter
Vacuum hoses and clamps
Related Error Codes