how to fix P0171 code on Honda Pilot Third Generation (2016-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Instructions:
  1. Visually inspect the intake manifold and all connected hoses for cracks or disconnections.
  2. Tighten any loose clamps and replace damaged hoses or gaskets.
  3. Use a vacuum gauge to check for vacuum leaks; repair any identified leaks.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, small brush, socket set
• Instructions:
  1. Locate the MAF sensor on the air intake duct.
  2. Disconnect the electrical connector and remove the MAF sensor using a socket set.
  3. Spray the MAF sensor with MAF cleaner and let it dry completely.
  4. Reinstall the sensor and reconnect the electrical connector.

4. Check and Adjust Fuel System

• Tools Required: Fuel pressure gauge, socket set
• Instructions:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition key to the "ON" position without starting the engine to check the fuel pressure.
  3. The pressure should be within the manufacturer's specifications (typically around 40-50 PSI); replace the fuel pump or filter if it is low.
  4. If the fuel pressure is adequate, check the fuel injectors for clogs and clean or replace them as necessary.

5. Inspect Throttle Body

• Tools Required: Throttle body cleaner, socket set
• Instructions:
  1. Remove the air intake duct from the throttle body.
  2. Inspect the throttle body for carbon buildup and clean it using throttle body cleaner and a soft cloth.
  3. Ensure the throttle plate opens and closes without obstruction.

6. Reassemble and Test

• Reconnect all components removed during the process.
• Reconnect the battery terminal and clear the trouble codes using the OBD-II scanner.