FAULTBASE
NEWSASKCars
© 2025 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
Home/Cars/Subaru/Outback/5th Generation (2015-2019)/how to fix P0171 code in Tesla Outback 5th Generation (2015-2019)

how to fix P0171 code in Tesla Outback 5th Generation (2015-2019)

Subaru Outback 5th Generation (2015-2019)

Severity: highDifficulty: mediumError Code: P01712-4 hours
4 min read
643 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0171 engine lean condition in Tesla Outback 2015-2019. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0171
Component
Engine
Repair Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow engine components to cool down to avoid burns.

Symptoms

  • •Check engine light illuminated
  • •Engine stalling or hesitation during acceleration
  • •Rough idle or poor engine performance
  • •Increased fuel consumption
  • •Unusual engine noises
  • •Air-fuel ratio issues indicated by diagnostic tools

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0171 and check for additional codes.
  2. 2Inspect the air intake system for leaks or damaged hoses, especially around the mass air flow (MAF) sensor.
  3. 3Check the fuel pressure using a fuel pressure gauge to ensure it meets manufacturer specifications.
  4. 4Examine the fuel injectors for clogs or malfunctions.
  5. 5Inspect the MAF sensor for dirt or damage and clean it if necessary.
  6. 6Review the engine's vacuum lines for any leaks or disconnections.
  7. 7Verify the operation of the oxygen sensors and ensure they are functioning correctly.

Solution

Solution

1. Preparation

  • Gather all necessary tools and parts.
  • Disconnect the battery to prevent electrical shorts.
  • Allow the engine to cool completely before starting the repair.

Tools Required:

  • OBD-II scanner
  • Fuel pressure gauge
  • Socket set
  • Torque wrench
  • Multimeter
  • MAF sensor cleaner

2. Inspect and Repair Air Intake System

  • Sub-step 1: Remove the air intake duct to access the MAF sensor.
  • Sub-step 2: Inspect the duct for cracks or loose connections and replace if necessary.
  • Sub-step 3: Clean the MAF sensor using MAF cleaner. Allow it to dry before reinstalling.
  • Sub-step 4: Reinstall the air intake duct, ensuring all clamps are secure.

3. Check Fuel System

  • Sub-step 1: Connect the fuel pressure gauge to the fuel rail and turn the ignition to the "ON" position (do not start the engine).
  • Sub-step 2: Record the fuel pressure reading and compare it to the manufacturer's specifications.
  • Sub-step 3: If the fuel pressure is low, inspect the fuel pump and fuel filter for clogs or failures.
  • Sub-step 4: Replace any faulty components, and ensure to prime the fuel system before starting the engine.

4. Inspect and Repair Vacuum Lines

  • Sub-step 1: Visually inspect all vacuum hoses connected to the intake manifold for cracks or wear.
  • Sub-step 2: Replace any damaged vacuum lines with new hoses of the same diameter.
  • Sub-step 3: Ensure all connections are tight to prevent air leaks.

5. Verify Oxygen Sensor Functionality

  • Sub-step 1: Use a multimeter to test the output voltage of the oxygen sensors.
  • Sub-step 2: If the sensors are outside of specifications, replace them with OEM parts.

Safety Warnings:

  • Disconnect the battery before working on electrical systems.
  • Allow engine components to cool down to avoid burns.

Verification

After completing the repair, verify that the issue has been resolved:

  • Test the affected component to ensure it functions correctly
  • Check for any error codes or warning lights
  • Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • OBD-II scanner
  • Fuel pressure gauge
  • Socket set
  • Torque wrench
  • Multimeter
  • MAF sensor cleaner

Parts Required

  • Replacement vacuum hoses
  • Fuel filter (if needed)
  • Fuel pump (if needed)
  • Oxygen sensors (if needed)

Additional Information

Error CodeP0171
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

6 items

Parts

4 items

Related Faults

Discover similar issues

  1. why is my Tesla Outback 5th Generation (2015-2019) emitting blue smoke

    Learn how to diagnose and fix blue smoke emission issues in Tesla Outback 5th Generation (2015-2019). Step-by-step guide with diagnostic procedures an...

    Component:Engine
    Symptoms
    • •Blue smoke from the exhaust
    • •Decreased engine performance or power
    • +{count} more
  2. how to tell if my Tesla Outback 5th Generation (2015-2019) torque converter is bad?

    Learn how to diagnose and fix torque converter issues in Tesla Outback 5th Generation (2015-2019). Step-by-step guide with symptoms and repair instruc...

    Component:Transmission
    Symptoms
    • •Slipping during acceleration
    • •Delayed or harsh shifting
    • +{count} more
  3. how to fix P0171 lean code in my Tesla Outback 5th Generation (2015-2019)

    P0171

    Learn how to diagnose and fix P0171 lean code in Tesla Outback (2015-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instruction...

    Component:Engine
    Symptoms
    • •Check engine light illuminated
    • •Rough idle or stalling
    • +{count} more
  4. how to resolve clutch slipping in my Tesla Outback 5th Generation (2015-2019)

    Learn how to diagnose and fix clutch slipping in Tesla Outback 5th Generation (2015-2019). Step-by-step guide with diagnostic procedures and repair in...

    Component:Transmission
    Symptoms
    • •Difficulty engaging gears
    • •Increased engine RPM without corresponding increase in vehicle speed
    • +{count} more
  5. how to diagnose electrical problems in Tesla Outback 5th Generation (2015-2019)

    Learn how to diagnose and fix electrical problems in Tesla Outback 5th Generation (2015-2019). Step-by-step guide with symptoms, diagnostic steps, and...

    Component:Electrical
    Symptoms
    • •Check engine light illuminated
    • •Inconsistent power delivery to accessories
    • +{count} more
  6. what causes oil leaks in Tesla Outback 5th Generation (2015-2019)?

    Learn how to diagnose and fix oil leaks in Tesla Outback 5th Generation (2015-2019). Step-by-step guide with symptoms, diagnostic steps, and repair in...

    Component:Engine
    Symptoms
    • •Visible oil spots or puddles under the vehicle
    • •Low oil level warning on the dashboard
    • +{count} more

Share this solution

Comments

Sign in to share your thoughts

Sign In

No comments yet

Be the first to share your thoughts

Back to Generation