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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, silicone sealant.
• Inspect all vacuum hoses for cracks or disconnections.
• Use a vacuum gauge to test the intake manifold for leaks.
• Repair or replace any damaged hoses and seal connections with silicone sealant as needed.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner or isopropyl alcohol, soft cloth.
• Locate the MAF sensor in the intake path.
• Disconnect the electrical connector and remove the sensor.
• Clean the sensor with MAF cleaner.
• Allow it to dry completely before reinstalling. If damaged, replace with a new sensor.

4. Test and Repair Fuel System

• Tools Required: Fuel pressure gauge, injector cleaning kit.
• Connect a fuel pressure gauge to the fuel rail and turn on the ignition to check the pressure.
• If the pressure is low, inspect the fuel pump and filter; replace as necessary.
• Use an injector cleaning kit to clean the fuel injectors if they are clogged.

5. Confirm Exhaust System Integrity

• Tools Required: Exhaust smoke tester (if needed).
• Inspect the exhaust system for any cracks or leaks.
• Use an exhaust smoke tester to identify hidden leaks, especially near the manifold.
• Repair or replace any damaged components.