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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety during repairs.

Tools Required:

• OBD-II scanner
• Multimeter
• Socket set
• Torque wrench
• Screwdrivers
• Fuel pressure gauge
• Cleaning supplies (e.g., MAF cleaner)

2. Inspect Vacuum Leaks

• Visually inspect all vacuum hoses connected to the intake manifold and throttle body.
• Use a smoke machine or carburetor cleaner to identify leaks.
• If a leak is found, replace the affected hose or gasket.

3. Clean or Replace MAF Sensor

• Remove the MAF sensor from the intake duct.
• Use MAF sensor cleaner to spray the sensor elements; do not touch them with your hands.
• Allow it to dry completely before reinstallation. If damaged, replace with a new MAF sensor.

4. Check Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition on (do not start the engine) and check the fuel pressure reading.
• If the pressure is below specifications (refer to manufacturer specs), inspect and replace the fuel pump or filter as needed.

5. Inspect and Clean Throttle Body

• Remove the intake duct to access the throttle body.
• Clean the throttle body using throttle body cleaner and a soft cloth.
• Ensure the throttle plate moves freely and is not sticking.

6. Reconnect and Clear Codes

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0171 code.
• Start the engine and monitor for any reoccurring codes.