how to fix P0171 code in Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

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

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Use a smoke machine or carburetor cleaner to identify vacuum leaks around hoses and gaskets.
  2. Replace any damaged hoses, gaskets, or seals found during the inspection.
• Tools Required: Smoke machine, carburetor cleaner, pliers.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Remove the MAF sensor from the intake duct.
  2. Clean the MAF sensor with MAF cleaner spray. Do not touch the sensing elements.
  3. If cleaning does not resolve issues, replace the MAF sensor with a new one.
• Tools Required: Screwdriver, MAF cleaner spray.

4. Check and Replace Fuel Filter (If Necessary)

• Sub-steps:
  1. Locate the fuel filter and examine it for clogs.
  2. If clogged, relieve fuel pressure, disconnect the fuel lines, and replace the fuel filter.
• Tools Required: Fuel line removal tool, wrench set.

5. Test Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the ON position without starting the engine to check fuel pressure.
  3. Compare the reading to specifications; if low, check the fuel pump and related components.
• Tools Required: Fuel pressure gauge.

6. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Clear the P0171 code using the OBD-II scanner.
• Tools Required: OBD-II scanner.