P0171 on FORD F-150 — System Too Lean Bank 1

Q: "What does P0171 mean on a FORD F-150?"

"P0171 indicates: System Too Lean Bank 1. This is a fuel and air metering code. 2 FORD F-150 owners have reported this to NHTSA."

Q: "What are the most common causes of P0171 on FORD F-150?"

"Based on 2 NHTSA reports, the most commonly cited components are: Engine And Engine Cooling, Electrical System,Engine,Fuel/Propulsion System. These percentages are based on the component field in owner complaints."

Q: "Is P0171 serious on my FORD F-150?"

"Of 2 NHTSA reports for this code on FORD F-150, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my FORD F-150 shows P0171?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

What P0171 Means on Your FORD F-150

P0171 is a diagnostic trouble code indicating: System Too Lean Bank 1. This code relates to the fuel and air metering system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

2 FORD F-150 owners have reported this issue to NHTSA across model years 2005-2006. Most reports come from the 2005, 2006 model years. The most commonly reported component is Engine And Engine Cooling (50.0% of reports).

Real FORD F-150 Owner Reports

Source: NHTSA Complaints Database

"Experienced sudden loss of power steering and power brakes while normal and routine driving on highway. no warning of any kind that failure was about to occur. engine ran rough, engine light warning came on after brake and steering failure and then engine shut off."

— 2005 FORD F-150 owner · ENGINE AND ENGINE COOLING · Filed 08/04/2007

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

1

'05

1

'06

Common Causes on FORD F-150

Based on NHTSA complaint component analysis for this vehicle.

ENGINE and ENGINE COOLING 50%

ELECTRICAL SYSTEM,ENGINE,FUEL/PROPULSION SYSTEM 50%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does P0171 mean on a FORD F-150? ▾

P0171 indicates: System Too Lean Bank 1. This is a fuel and air metering code. 2 FORD F-150 owners have reported this to NHTSA.

What are the most common causes of P0171 on FORD F-150? ▾

Based on 2 NHTSA reports, the most commonly cited components are: Engine And Engine Cooling, Electrical System,Engine,Fuel/Propulsion System. These percentages are based on the component field in owner complaints.

Is P0171 serious on my FORD F-150? ▾

Of 2 NHTSA reports for this code on FORD F-150, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my FORD F-150 shows P0171? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.