P0171 on TOYOTA HIGHLANDER — System Too Lean Bank 1

Q: "What does P0171 mean on a TOYOTA HIGHLANDER?"

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

Q: "What are the most common causes of P0171 on TOYOTA HIGHLANDER?"

"Based on 2 NHTSA reports, the most commonly cited components are: Fuel/Propulsion System, Unknown Or Other,Service Brakes,Fuel/Propulsion System. These percentages are based on the component field in owner complaints."

Q: "Is P0171 serious on my TOYOTA HIGHLANDER?"

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

Q: "What should I do if my TOYOTA HIGHLANDER 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 TOYOTA HIGHLANDER

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 TOYOTA HIGHLANDER owners have reported this issue to NHTSA across model years 2019. Most reports come from the 2019 model year. The most commonly reported component is Fuel/Propulsion System (50.0% of reports).

Real TOYOTA HIGHLANDER Owner Reports

Source: NHTSA Complaints Database

"Vehicle hesitates and sputters upon acceleration, loss of power, and stalls during operation. Trouble codes P0191, P0171, P0174, and P0107B have generated in combination."

— 2019 TOYOTA HIGHLANDER owner · FUEL/PROPULSION SYSTEM · Filed 03/08/2026

"Vehicle check engine turned on to check AWD system after about 2 days when filling with gas the engine wouldn't start and had Low brake power message on dashboard."

— 2019 TOYOTA HIGHLANDER owner · UNKNOWN OR OTHER,SERVICE BRAKES,FUEL/PROPULSION SYSTEM · Filed 06/06/2023

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

📊 Complaint Trend by Model Year

2

'19

Common Causes on TOYOTA HIGHLANDER

Based on NHTSA complaint component analysis for this vehicle.

FUEL/PROPULSION SYSTEM 50%

UNKNOWN or OTHER,SERVICE BRAKES,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 TOYOTA HIGHLANDER? ▾

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

What are the most common causes of P0171 on TOYOTA HIGHLANDER? ▾

Based on 2 NHTSA reports, the most commonly cited components are: Fuel/Propulsion System, Unknown Or Other,Service Brakes,Fuel/Propulsion System. These percentages are based on the component field in owner complaints.

Is P0171 serious on my TOYOTA HIGHLANDER? ▾

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

What should I do if my TOYOTA HIGHLANDER 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.