Last reported case: 6 months ago
Based on 5 owner reports
What is P0171?
P0171 indicates your engine's Bank 1 is running with too much air and not enough fuel, which is called a 'lean' condition. This is a medium-severity powertrain issue that can reduce fuel economy and performance, and it's commonly triggered by vacuum leaks or faulty sensors. Based on 551 reports, repairs for this code average $4596, with Ford Mustangs and F-150s being among the most frequently affected vehicles.
Common Causes:
- Vacuum leaks in intake hoses or gaskets (reported in numerous discussion clusters)
- Faulty mass airflow (MAF) or oxygen (O2) sensors
- Clogged or failing fuel injectors
- Fuel delivery issues like a weak fuel pump or clogged filter
Symptoms:
- Check Engine Light is illuminated
- Reduced engine power or hesitation during acceleration
- Poor fuel economy
- Rough idle or engine misfires
🚗P0171 on 2019 FORD F-150
This page focuses specifically on P0171 issues reported by 2019 FORD F-150 owners. The experiences and fixes below are from real owners of this exact vehicle.
Symptoms Reported by 2019 FORD F-150 Owners:
Parts Often Involved:
What Owners Say
Real experiences from 2019 FORD F-150 owners
“Cleaned the MAF sensor, still getting the code.”View original
“Check engine light with P0171 lean condition on my 2017 F-150 5.0L.”View original
“Cleaned the MAF sensor, still getting the code. Hesitation on acceleration.”View original
“P0171 Lean Bank 1 - 2017 F-150 Check engine light with P0171 lean condition on my 2017 F-150 5.0L.”View original
These are real experiences shared by 2019 FORD F-150 owners on automotive forums and communities. Results may vary based on vehicle condition and repair quality.
About This Data
This page aggregates 5 discussions about P0171 from 2019 FORD F-150 owners across automotive communities.
Success rate (0%) is calculated from posts where owners confirmed whether their fix resolved the issue.
Last updated: 8/20/2025