how to fix P0171 code in Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

• Gather tools and safety equipment: gloves, safety glasses, OBD-II scanner, multimeter, fuel pressure gauge, socket set.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold.
  • Use a smoke machine or carburetor cleaner to identify leaks.
  • Replace any damaged or brittle hoses.
• Tools Required: Smoke machine or carburetor cleaner.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Disconnect the electrical connector from the MAF sensor.
  • Remove the MAF sensor from the air intake duct using a socket set.
  • Clean the sensor with MAF cleaner; do not touch the sensing elements.
  • Reinstall the MAF sensor and reconnect the electrical connector.
• Tools Required: Socket set, MAF cleaner.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  • Locate the fuel rail and connect a fuel pressure gauge.
  • Turn the ignition to the "on" position (do not start the engine) to check fuel pressure.
  • Compare the reading with the manufacturer's specifications (typically 40-50 psi).
  • If pressure is low, check the fuel pump and filter for issues.
• Tools Required: Fuel pressure gauge.

5. Inspect Fuel Injectors

• Sub-steps:
  • Remove the engine cover to access the fuel injectors.
  • Visually inspect injectors for signs of wear or leaks.
  • Test each injector for proper operation with a multimeter.
  • Clean or replace faulty injectors as necessary.
• Tools Required: Multimeter, socket set.

6. Examine Exhaust System

• Sub-steps:
  • Inspect the exhaust manifold and pipes for leaks or cracks.
  • Check the oxygen sensors for proper connection and functionality.
  • Replace any faulty sensors or repair leaks as needed.
• Tools Required: Socket set.