AutoCodes – Scion – P0171 2006 Scion xB

P0171 2006 Scion xB Code - Air/Fuel Mixture System Lean Bank 1

Quick Answer

The fuel trim is related to the feedback compensation value, not to the basic injection time. Common causes include Intake air leaks, EFI relay, Faulty front heated oxygen 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 2006 Scion xB indicates Air/Fuel Mixture System Lean Bank 1.
Common causes: Common causes include Intake air leaks, EFI relay, Faulty front heated oxygen 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 7,385

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 Jul 20, 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 2006 Scion xB Description

The fuel trim is related to the feedback compensation value, not to the basic injection time. The fuel trim consists of both the 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 front Heated Oxygen (HO2) 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 it is lean. Factors such as individual engine differences, wear over time and changes in 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.

OBDII Code P0171 2006 Scion xB - Air/Fuel Mixture System Lean Bank 1 - AutoCodes.com — P0171 2006 Scion xB Code - Air/Fuel Mixture System Lean Bank 1

What does this mean?

What are the Possible Causes of the DTC P0171 2006 Scion xB?

Intake air leaks
EFI relay
Faulty front heated oxygen sensor
Ignition misfiring
Faulty fuel injectors
Exhaust gas leaks
Incorrect fuel pressure
Lack of fuel
Faulty Mass Air Flow (MAF) sensor
Incorrect Positive Crankcase Ventilation (PCV) hose connection
ECM

How to Fix the DTC P0171 2006 Scion xB?

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 very 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 air flow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0171 2006 Scion xB 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.

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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 2006 Scion xB Code

1. What does OBDII code P0171 mean for a 2006 Scion xB?

- OBDII code P0171 indicates that the air/fuel mixture system on Bank 1 is running too lean in a 2006 Scion xB.

2. What are common symptoms of OBDII code P0171 in a 2006 Scion xB?

- Common symptoms of P0171 in a 2006 Scion xB include rough idle, poor acceleration, and potentially decreased fuel efficiency.

3. What are some possible causes of OBDII code P0171 in a 2006 Scion xB?

- Possible causes of P0171 in a 2006 Scion xB 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 in a 2006 Scion xB?

- Diagnosing P0171 in a 2006 Scion xB typically involves checking for vacuum leaks, inspecting the oxygen sensor, cleaning or replacing the fuel injectors, and testing the mass airflow sensor.

5. Can a dirty air filter cause OBDII code P0171 in a 2006 Scion xB?

- Yes, a dirty air filter can restrict airflow and lead to a lean air/fuel mixture, triggering OBDII code P0171 in a 2006 Scion xB.

6. How can I repair OBDII code P0171 in a 2006 Scion xB?

- Repairing P0171 in a 2006 Scion xB may involve fixing any vacuum leaks, replacing the oxygen sensor, cleaning or replacing the fuel injectors, or repairing/replacing the mass airflow sensor.

7. Is it safe to continue driving with OBDII code P0171 in a 2006 Scion xB?

- It is not recommended to continue driving with P0171 in a 2006 Scion xB, as running too lean can potentially lead to engine damage if not addressed promptly.

8. How much does it typically cost to repair OBDII code P0171 in a 2006 Scion xB?

- The cost to repair P0171 in a 2006 Scion xB can vary depending on the specific cause, but it may range from around $100 for a simple fix (e.g., replacing an air filter) to several hundred dollars for more complex repairs.

9. Can a DIY enthusiast fix OBDII code P0171 in a 2006 Scion xB?

- Some aspects of repairing P0171 in a 2006 Scion xB, such as replacing an air filter or cleaning fuel injectors, can be done by a DIY enthusiast with the right tools and knowledge. However, more complex issues may require professional help.

10. Is it necessary to reset the OBDII code P0171 after repairing a 2006 Scion xB?

- Yes, it is recommended to reset the OBDII code P0171 after completing repairs on a 2006 Scion xB to clear the fault code and ensure the issue has been resolved.

Discuss the causes and fixes for P0171 2006 Scion xB OBDII Code

Submit a New Comment

stevekooser
Date: August 4, 2018 at 5:44 am

Can code 171 be caused by the use of E15 fuel? I am running my 3rd tank of this stuff and I had 3 lights pop on today.....VSC, trac off, and check engine.

Reply to Comment
OBDIITech
Date: August 4, 2018 at 6:20 pm

Yes, that is a know issue. If you continue using E15, then the Engine Control Module (ECM) will advance the timing and you may end up using more fuel than before.

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