how to fix P0171 code in Honda Accord 9th Generation (2013-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent any electrical shorts.
• Allow the engine to cool if it has been running.

2. Inspect and Repair Intake System

• Tools Required: Socket set, vacuum gauge, flashlight
• Locate and inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Tighten or replace any loose or damaged hoses.
• Check the intake manifold for proper sealing against the engine block. Replace the gasket if necessary.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, Torx screwdriver
• Remove the MAF sensor from the air intake duct using a Torx screwdriver.
• Clean the MAF sensor with MAF cleaner. Allow it to dry completely before reinstalling.
• If the sensor is damaged, replace it with a new one.

4. Fuel System Check

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "On" position (do not start the engine) to check the fuel pressure; it should be within the manufacturer’s specifications (typically around 40-50 psi).
• If the pressure is low, inspect the fuel pump, fuel filter, and fuel lines for issues.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaner, multimeter
• If injectors are suspected, perform a balance test using a multimeter to check their resistance.
• Clean or replace any clogged or faulty fuel injectors using an injector cleaning kit.

6. Verify O2 Sensor Functionality

• Tools Required: Multimeter
• Test the O2 sensor's voltage output while the engine is running; it should fluctuate between 0.1V and 0.9V.
• Replace the O2 sensor if it is outside this range during operation.