P0171 on TOYOTA RAV4 — System Too Lean Bank 1

Q: "What does P0171 mean on a TOYOTA RAV4?"

"P0171 indicates: System Too Lean Bank 1. This is a fuel and air metering code. 4 TOYOTA RAV4 owners have reported this to NHTSA."

Q: "What are the most common causes of P0171 on TOYOTA RAV4?"

"Based on 4 NHTSA reports, the most commonly cited components are: Vehicle Speed Control,Service Brakes,Fuel/Propulsion System, Unknown Or Other,Fuel/Propulsion System, Fuel/Propulsion System. These percentages are based on the component field in owner complaints."

Q: "Is P0171 serious on my TOYOTA RAV4?"

"Of 4 NHTSA reports for this code on TOYOTA RAV4, 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 RAV4 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 RAV4

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.

4 TOYOTA RAV4 owners have reported this issue to NHTSA across model years 2007-2022. Most reports come from the 2007, 2015 model years.

Real TOYOTA RAV4 Owner Reports

Source: NHTSA Complaints Database

"First noticed the problem on 11/10/2014 when approaching a stop light. the rav4 took longer than normal to come to a stop with greater force required to stop. once fully stopped, the vehicle was idling with low rpm's (~500) and the check engine light turned on along with vsc and trac lights."

— 2007 TOYOTA RAV4 owner · VEHICLE SPEED CONTROL,SERVICE BRAKES,FUEL/PROPULSION SYSTEM · Filed 11/10/2014

"Ongoing issues with my fuel system. car will display one of these many symptoms: -misfire, hard start, stall or shutoff. other symptoms include car stuttering and stalling out while driving. this last symptom is very dangerous as it often comes with no warning."

— 2015 TOYOTA RAV4 owner · UNKNOWN OR OTHER,FUEL/PROPULSION SYSTEM · Filed 05/22/2020

"Sudden, unexpected, surprise Surging Idle upon placing the vehicle in Park after driving a 15 minute distance at a top speed of 35mph. Loud Surge up to 2.5 (x1000RPM) Sounds like the Engine Shifted Idle Drops down and immediately begins Surging up again. Idle is high while driving."

— 2019 TOYOTA RAV4 owner · FUEL/PROPULSION SYSTEM · Filed 06/16/2025

"I was driving home in the rain for about 75 minutes and when I arrived in my driveway I saw steam coming from the front grille area. It wasn't due to a high engine coolant temperature so I decided to carefully open the hood and check for the source."

— 2022 TOYOTA RAV4 owner · ELECTRICAL SYSTEM,ENGINE,FUEL/PROPULSION SYSTEM · Filed 02/20/2026

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

📊 Complaint Trend by Model Year

1

'07

1

'15

1

'19

1

'22

Common Causes on TOYOTA RAV4

Based on NHTSA complaint component analysis for this vehicle.

VEHICLE SPEED CONTROL,SERVICE BRAKES,FUEL/PROPULSION SYSTEM 25%

UNKNOWN or OTHER,FUEL/PROPULSION SYSTEM 25%

FUEL/PROPULSION SYSTEM 25%

ELECTRICAL SYSTEM,ENGINE,FUEL/PROPULSION SYSTEM 25%

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 RAV4? ▾

P0171 indicates: System Too Lean Bank 1. This is a fuel and air metering code. 4 TOYOTA RAV4 owners have reported this to NHTSA.

What are the most common causes of P0171 on TOYOTA RAV4? ▾

Based on 4 NHTSA reports, the most commonly cited components are: Vehicle Speed Control,Service Brakes,Fuel/Propulsion System, Unknown Or Other,Fuel/Propulsion System, Fuel/Propulsion System. These percentages are based on the component field in owner complaints.

Is P0171 serious on my TOYOTA RAV4? ▾

Of 4 NHTSA reports for this code on TOYOTA RAV4, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my TOYOTA RAV4 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.