AutoCodes – Toyota – P0171 2013 Toyota RAV4

P0171 2013 Toyota RAV4 Code - Fuel Trim System Too Lean Bank 1

Quick Answer

The fuel trim is related to the feedback compensation value, not to the basic injection duration. Common causes include Intake air leaks, Fuel injector blockage, Faulty Mass Air Flow (MAF) sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0171 2013 Toyota RAV4 indicates Fuel Trim System Too Lean Bank 1.
Common causes: Common causes include Intake air leaks, Fuel injector blockage, Faulty Mass Air Flow (MAF) sensor.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,284

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 24, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0171 2013 Toyota RAV4 Description

The fuel trim is related to the feedback compensation value, not to the basic injection duration. The fuel trim consists of both short-term and long-term fuel trims.
The short-term fuel trim is fuel compensation that is used to constantly maintain the air-fuel ratio at stoichiometric levels. The signal from the air-fuel ratio sensor indicates whether the air-fuel ratio is rich or lean compared to the stoichiometric ratio. This triggers a reduction in the fuel injection volume if the air-fuel ratio is rich and an increase in the fuel injection volume if lean.
Factors such as individual engine differences, wear over time, and changes in the operating environment cause short-term fuel trim to vary from the central value. The long-term fuel trim, which controls overall fuel compensation, compensates for long-term deviations in the fuel trim from the central value caused by the short-term fuel trim compensation.
Under closed-loop fuel control, fuel injection volumes that deviate from those estimated by the Engine Control Module (ECM) cause changes in the long-term fuel trim compensation value. The long-term fuel trim is adjusted when there are persistent deviations in the short-term fuel trim values. Deviations from the fuel injection volumes estimated by the ECM also affect the average fuel trim learned value, which is a combination of the average short-term fuel trim (fuel feedback compensation value) and the average long-term fuel trim (learned value of the air fuel ratio). If the average fuel trim learned value exceeds the malfunction thresholds, the ECM interprets this as a fault in the fuel system and stores a Diagnostic Trouble Code (DTC).

OBDII Code P0171 2013 Toyota RAV4 - Fuel Trim System Too Lean Bank 1 - AutoCodes.com — P0171 2013 Toyota RAV4 Code - Fuel Trim System Too Lean Bank 1

What does this mean?

What are the Possible Causes of the DTC P0171 2013 Toyota RAV4?

Intake air leaks
Fuel injector blockage
Faulty Mass Air Flow (MAF) sensor
Faulty Engine Coolant Temperature Sensor
Faulty Air Fuel Ratio (A/F) Sensor (Front Oxygen Sensor)
Incorrect fuel pressure
Gas leak from exhaust system
Faulty Positive Crankcase Ventilation (PCV) hose connection
Air Fuel Ratio Sensor harness is open or shorted
Air Fuel Ratio Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0171 2013 Toyota RAV4?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

If the P0171 is combined with the P0174 code, it's highly likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the Mass Air Flow (MAF) Sensor. If the problem persists the Air Fuel Ratio (A/F) Sensor (Front Oxygen Sensor) may need to be replaced. If the vehicle runs out of fuel, the air-fuel ratio is lean and DTC P0171 may be stored.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0171 2013 Toyota RAV4 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0171 2013 Toyota RAV4 code?

Need more information on how to fix the P0171 2013 Toyota RAV4 code? Get Access to Factory Service Manuals

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0171 2013 Toyota RAV4 Code

1. What does OBDII code P0171 on a 2013 Toyota RAV4 indicate?

The code P0171 on a 2013 Toyota RAV4 indicates a "Fuel Trim System Too Lean Bank 1" issue.

2. What are the common symptoms of OBDII code P0171 on a 2013 Toyota RAV4?

Common symptoms of P0171 in a 2013 Toyota RAV4 include rough idling, poor acceleration, hesitation, and potential stalling.

3. What are the possible causes of OBDII code P0171 on a 2013 Toyota RAV4?

Possible causes of P0171 in a 2013 Toyota RAV4 include a vacuum leak, faulty oxygen sensor, dirty or clogged fuel injectors, or a malfunctioning mass airflow sensor.

4. How can I diagnose the OBDII code P0171 on my 2013 Toyota RAV4?

To diagnose P0171 on a 2013 Toyota RAV4, you can perform a visual inspection for damaged hoses, check the oxygen sensor readings, inspect the air intake system, and test the fuel pressure.

5. Can a dirty air filter trigger the OBDII code P0171 on a 2013 Toyota RAV4?

Yes, a dirty air filter can contribute to a lean fuel mixture, triggering the OBDII code P0171 on a 2013 Toyota RAV4.

6. How critical is it to address the OBDII code P0171 on a 2013 Toyota RAV4 promptly?

It is important to address the P0171 code promptly on a 2013 Toyota RAV4 to prevent potential damage to the engine and ensure optimal performance and fuel efficiency.

7. Is it safe to continue driving my 2013 Toyota RAV4 with the OBDII code P0171 present?

While it may be possible to drive with the P0171 code present, it is not recommended as it can lead to decreased fuel efficiency, engine performance issues, and potential long-term damage.

8. Can a faulty fuel pump cause the OBDII code P0171 on a 2013 Toyota RAV4?

Yes, a faulty fuel pump can cause insufficient fuel delivery, leading to a lean fuel mixture and triggering the OBDII code P0171 on a 2013 Toyota RAV4.

9. How much does it typically cost to fix the OBDII code P0171 on a 2013 Toyota RAV4?

The cost to fix the P0171 code on a 2013 Toyota RAV4 can vary depending on the root cause, but it may range from a simple repair like replacing a vacuum hose to more complex fixes like replacing sensors or cleaning fuel injectors.

10. Can a DIY enthusiast address the OBDII code P0171 on a 2013 Toyota RAV4, or is it advisable to seek professional help?

While some basic troubleshooting steps can be performed by a DIY enthusiast, addressing the P0171 code on a 2013 Toyota RAV4 often requires specialized tools and expertise, so seeking professional help is advisable for accurate diagnosis and repairs.