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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses for cracks or disconnections.
  • Perform a smoke test to identify hidden leaks if necessary.
  • Replace any damaged hoses or use appropriate sealants on connections.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Disconnect the electrical connector and remove the sensor.
  • Use MAF cleaner to gently clean the sensor element. Allow it to dry completely.
  • Reinstall the sensor, reconnect the electrical connector, and ensure it's secured.

4. Check Fuel System

• Sub-steps:
  • Use a fuel pressure gauge to check fuel pressure at the rail; it should match manufacturer specifications (typically around 40-50 psi).
  • If pressure is low, check the fuel filter for clogs and replace if necessary.
  • Inspect the fuel injectors for proper operation and cleanliness; clean or replace if needed.

5. Inspect Engine Coolant Temperature Sensor

• Sub-steps:
  • Locate the engine coolant temperature sensor (usually near the thermostat housing).
  • Disconnect the electrical connector and measure resistance with a multimeter.
  • Compare readings with specifications; replace the sensor if readings are out of range.