how to fix P0171 code on Honda Accord Eleventh Generation (2023-present)

Solution

1. Preparation

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

Tools Required:

• OBD-II scanner
• Fuel pressure gauge
• Screwdrivers (flat and Phillips)
• Socket set
• Torque wrench
• MAF cleaner (if cleaning is necessary)
• Vacuum gauge (optional)

2. Inspect and Repair Air Intake System

• Step 1: Visually inspect all air intake hoses and connections for cracks or loose fittings.
• Step 2: Replace any damaged hoses or tighten loose connections.
• Step 3: If needed, replace the air filter to ensure proper airflow.

3. Check and Clean MAF Sensor

• Step 1: Locate the MAF sensor in the air intake duct.
• Step 2: Disconnect the electrical connector and remove the sensor using a socket.
• Step 3: Use MAF cleaner to spray and clean the sensor.
• Step 4: Allow the sensor to dry completely before reinstalling it.

4. Verify Fuel Pressure

• Step 1: Connect the fuel pressure gauge to the fuel rail.
• Step 2: Turn the ignition to the "ON" position (do not start the engine) and check for proper pressure according to manufacturer specifications (typically around 40-50 PSI).
• Step 3: If the pressure is low, check the fuel pump and filter for replacement.

5. Inspect and Test Oxygen Sensors

• Step 1: Locate the upstream oxygen sensor and disconnect its electrical connector.
• Step 2: Use a multimeter to test the sensor’s voltage output; it should fluctuate between 0.1V and 0.9V.
• Step 3: Replace the sensor if it is not functioning correctly.

6. Clear Codes and Test Drive

• Step 1: Use the OBD-II scanner to clear the P0171 code.
• Step 2: Take the vehicle for a test drive to ensure the issue is resolved and the check engine light does not reappear.