why does my Honda Civic 11th Generation (2022-Present) error code P0171 keep coming back

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake System

• Remove the engine cover if applicable.
• Inspect the air intake hoses and connections for cracks or leaks and replace any damaged components.
• Tighten clamps securely to eliminate potential air leaks.

3. Clean or Replace MAF Sensor

• Carefully disconnect the MAF sensor wiring harness.
• Remove the MAF sensor from the intake duct.
• Clean the MAF sensor using MAF cleaner spray, allowing it to dry completely before reinstallation. If damaged, replace with a new sensor.
• Reinstall the MAF sensor and reconnect the wiring harness.

4. Check and Repair Fuel System

• Attach the fuel pressure gauge to the fuel rail.
• Start the engine and check if the fuel pressure is within specifications (typically around 40-50 psi for most engines).
• If pressure is low, inspect the fuel pump and filter for blockages and replace as necessary.
• Test the fuel injectors using a multimeter to ensure they are firing correctly; replace any faulty injectors.

5. Inspect Vacuum Lines and ECT Sensor

• Visually inspect all vacuum lines for wear or damage; replace any that are cracked or disconnected.
• Locate the ECT sensor and disconnect it. Test its resistance with a multimeter, comparing it to manufacturer specifications for temperature readings. Replace if out of range.