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Home/Cars/Honda/Pilot/YF3 (2016-2022)/how to fix P0174 code in Honda Pilot YF3 (2016-2022)

how to fix P0174 code in Honda Pilot YF3 (2016-2022)

Honda Pilot YF3 (2016-2022)

Severity: mediumDifficulty: mediumError Code: P01742-4 hours
4 min read
618 words

Problem Statement

Learn how to diagnose and fix P0174 system too lean issue in Honda Pilot YF3 (2016-2022). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0174
Component
Engine
Repair Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical components.
  • ⚠Allow the engine to cool before inspecting or working on the intake system.

Symptoms

  • •Check engine light illuminated
  • •Rough idle or stalling
  • •Poor fuel economy
  • •Increased emissions
  • •Hesitation during acceleration
  • •Engine misfires

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0174 and check for any related codes.
  2. 2Inspect the intake system for vacuum leaks, focusing on hoses, gaskets, and the intake manifold.
  3. 3Check the fuel pressure using a fuel pressure gauge to ensure it meets manufacturer specifications.
  4. 4Examine the mass air flow (MAF) sensor for dirt or damage, and clean or replace if necessary.
  5. 5Inspect the fuel injectors for clogs or malfunction.
  6. 6Verify the operation of the oxygen sensors, particularly the one upstream from the catalytic converter.

Solution

Solution

1. Preparation

  • Gather tools and parts. Disconnect the battery before starting any work.
  • Tools Required: OBD-II scanner, vacuum gauge, fuel pressure gauge, multimeter, socket set, cleaning solvent, MAF cleaner, torque wrench.

2. Inspect and Repair Vacuum Leaks

  • Sub-steps:
    • Visually inspect all vacuum hoses in the intake system for cracks or disconnections.
    • Use a vacuum gauge to test the intake manifold vacuum. If the reading is lower than normal, locate the source of the leak.
    • If any damaged hoses are found, replace them with OEM parts.

3. Check and Clean the MAF Sensor

  • Sub-steps:
    • Locate the MAF sensor, usually situated between the air filter and throttle body.
    • Carefully disconnect the electrical connector and remove the MAF sensor.
    • Clean the MAF sensor with MAF cleaner. Allow it to dry completely before reinstalling.
    • Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

  • Sub-steps:
    • Connect the fuel pressure gauge to the fuel rail according to the manufacturer’s specifications.
    • Turn the ignition on without starting the engine to check the fuel pressure. It should meet the specifications in the service manual (typically around 40-50 psi for Honda).
    • If pressure is low, check the fuel pump and filter for issues, and replace if necessary.

5. Inspect Fuel Injectors

  • Sub-steps:
    • Remove the engine cover (if applicable) and access the fuel injectors.
    • Visually inspect the injectors for leaks and ensure connections are secure.
    • If necessary, use a fuel injector cleaning kit to clean the injectors or replace them if they are faulty.

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
  • Vacuum gauge
  • Fuel pressure gauge
  • Multimeter
  • Socket set
  • Cleaning solvent
  • MAF cleaner
  • Torque wrench

Parts Required

  • Vacuum hoses (if damaged)
  • MAF sensor (if faulty)
  • Fuel filter (if clogged)
  • Fuel injectors (if malfunctioning)

Additional Information

Error CodeP0174
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

medium

Tools

8 items

Parts

4 items

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