how to fix my Honda Accord 10th Generation (2018-2022) that has a check engine light for P0171?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on the vehicle.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, and a flashlight.
• Sub-steps:
  1. Use a vacuum gauge to test for any vacuum leaks in the intake system.
  2. Inspect all vacuum lines for cracks or disconnections and replace them as necessary.
  3. Tighten any loose clamps on the intake manifold and throttle body.

3. Clean MAF Sensor

• Tools Required: MAF cleaner or isopropyl alcohol, lint-free cloth.
• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the intake duct.
  3. Spray the MAF cleaner onto the sensor elements and let it dry completely.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Adjust Fuel System

• Tools Required: Fuel pressure gauge, basic hand tools.
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail to check the fuel pressure against the manufacturer's specifications.
  2. If the pressure is low, inspect the fuel pump and fuel filter for functionality and replace if necessary.
  3. Verify the operation of the fuel injectors using a multimeter to ensure they are receiving the proper voltage.

5. Replace Engine Coolant Temperature Sensor (if necessary)

• Tools Required: Socket set, new coolant temperature sensor.
• Sub-steps:
  1. Locate the engine coolant temperature sensor on the engine block.
  2. Disconnect the electrical connector.
  3. Remove the old sensor using a socket.
  4. Install the new sensor and reconnect the electrical connector.