how to fix P0171 code on my Honda Civic 11th Generation (2022-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety while working on the vehicle.

Tools Required:

• OBD-II scanner
• Multimeter
• Fuel pressure gauge
• Socket set
• Torque wrench
• MAF sensor cleaner (if cleaning is necessary)

2. Inspect and Repair the Air Intake System

• Step 1: Visually inspect all air intake hoses and connections for cracks or disconnections. Replace any damaged hoses.
• Step 2: Check the intake manifold for any leaks; use a smoke machine if necessary. Repair any identified leaks.
• Step 3: Reconnect all hoses securely.

3. Fuel Pressure Check

• Step 1: Connect the fuel pressure gauge to the fuel rail’s test port.
• Step 2: Turn the ignition switch to the “On” position without starting the engine and observe the pressure reading.
• Step 3: Compare the reading to the manufacturer's specifications; if it is low, check the fuel pump and filter for issues.
• Step 4: If fuel pressure is adequate, disconnect the gauge and reassemble the fuel rail.

4. Clean or Replace MAF Sensor

• Step 1: Locate the MAF sensor in the air intake duct.
• Step 2: Disconnect the electrical connector and unscrew the MAF sensor from its housing.
• Step 3: If cleaning, spray the sensor with MAF cleaner according to the instructions. Allow it to dry completely.
• Step 4: Reinstall the MAF sensor and reconnect the electrical connector.

5. Check Fuel Injectors

• Step 1: Inspect fuel injectors for leaks or clogs by removing them from the fuel rail.
• Step 2: Use a multimeter to test the resistance of each injector; compare to manufacturer specifications.
• Step 3: If faulty, replace the injectors and reassemble.