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Home/Cars/Honda/CR-V/Sixth Generation (2023-present)/how to fix P0171 code in Honda CR-V Fifth Generation (2017-2022)

how to fix P0171 code in Honda CR-V Fifth Generation (2017-2022)

Honda CR-V Sixth Generation (2023-present)

Severity: mediumDifficulty: mediumError Code: P01712-4 hours
4 min read
621 words

Problem Statement

Learn how to diagnose and fix P0171 engine lean condition in Honda CR-V (2017-2022). 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 the engine to cool before opening the air intake or exhaust systems.

Symptoms

  • •Check engine light illuminated
  • •Rough idle
  • •Loss of power during acceleration
  • •Decreased fuel efficiency
  • •Engine stalling during low-speed maneuvers
  • •Unusual engine noises (e.g., backfiring)

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0171 and check for any additional codes.
  2. 2Inspect the air intake system for leaks, including hoses, clamps, and the intake manifold.
  3. 3Check the fuel pressure using a fuel pressure gauge to ensure it meets manufacturer's specifications.
  4. 4Inspect the mass air flow (MAF) sensor for dirt or damage and clean or replace as necessary.
  5. 5Examine the oxygen sensor (upstream) for proper function and wiring integrity.
  6. 6Verify the operation of the fuel injectors by listening for clicking sounds or checking resistance with a multimeter.

Solution

Solution

1. Preparation

  • Gather tools and parts necessary for the repair.
  • Disconnect the negative battery terminal to prevent electrical shorts.
  • Allow the engine to cool before starting work.

2. Inspect and Repair Air Intake System

  • Sub-steps:
    • Remove the engine cover if necessary.
    • Visually inspect all vacuum hoses and the intake manifold for cracks or disconnections.
    • Reconnect or replace any damaged hoses.
    • Tighten any loose clamps that secure the air intake components.

3. Clean or Replace MAF Sensor

  • Tools Required: MAF sensor cleaner, screwdriver
  • Sub-steps:
    • Locate the MAF sensor in the air intake duct.
    • Disconnect the electrical connector and remove the sensor with a screwdriver.
    • Clean the MAF sensor using an appropriate cleaner, following the product instructions.
    • If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check and Replace Fuel Pressure Regulator (if necessary)

  • Tools Required: Fuel pressure gauge, socket set
  • Sub-steps:
    • Attach the fuel pressure gauge to the fuel rail.
    • Turn the ignition on (do not start the engine) and check the fuel pressure reading.
    • If pressure is below specifications, inspect and replace the fuel pump or fuel pressure regulator as needed.

5. Inspect and Replace Oxygen Sensor (if necessary)

  • Tools Required: O2 sensor socket, wrench
  • Sub-steps:
    • Locate the upstream oxygen sensor in the exhaust manifold.
    • Disconnect the electrical connector and use the O2 sensor socket to remove it.
    • Install the new oxygen sensor and reconnect the electrical connector.

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
  • MAF sensor cleaner
  • Socket set
  • O2 sensor socket
  • Screwdriver

Parts Required

  • Mass air flow (MAF) sensor (if necessary)
  • Fuel pressure regulator (if necessary)
  • Upstream oxygen sensor (if necessary)

Additional Information

Error CodeP0171
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

medium

Tools

6 items

Parts

3 items

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