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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before working on components.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and connections for cracks or disconnections.
  2. If a leak is found, replace the damaged hose or reattach the loose connection.
  3. Use a smoke machine or carburetor cleaner to detect any hidden leaks.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Clean the MAF sensor using MAF cleaner spray (do not use other cleaners).
  4. If damaged, replace the MAF sensor with a new one.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail's service port.
  2. Start the engine and observe the fuel pressure reading; it should match the manufacturer’s specifications (usually around 40-50 PSI).
  3. If pressure is low, inspect the fuel pump, fuel filter, and fuel lines for blockages or failures. Replace any faulty components.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail to access the fuel injectors.
  2. Inspect injectors for clogs or leaks. Use a multimeter to check for proper resistance.
  3. Clean injectors using an ultrasonic cleaner or replace them if necessary.

6. Reconnect and Test

• Sub-steps:
  1. Reconnect all components, including the battery terminal.
  2. Clear the error codes using an OBD-II scanner.
  3. Start the engine and monitor for any check engine lights.