my Honda Civic 11th Generation (2022-Present) has a check engine light and code P0171, what should I...

Solution

1. Preparation

• Tools Required: OBD-II scanner, vacuum gauge, fuel pressure gauge, socket set, multimeter, cleaning supplies (electronic cleaner).
• Disconnect the battery to prevent electrical shorts and ensure safety.

2. Inspect and Clean MAF Sensor

• Locate the MAF sensor in the air intake system.
• Disconnect the electrical connector from the MAF sensor.
• Remove the MAF sensor from the intake tube using the appropriate socket.
• Clean the sensor element with MAF cleaner; do not touch the sensor directly.
• Allow the sensor to dry completely before reinstallation.

3. Check for Vacuum Leaks

• Visually inspect all vacuum hoses connected to the intake manifold and throttle body.
• Use a vacuum gauge to check for proper readings; replace any damaged hoses.
• If necessary, apply a smoke test to identify hard-to-find leaks.

4. Test Fuel Pressure

• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition key to the ON position (without starting the engine) and observe the pressure reading.
• Compare the reading to manufacturer specifications; if low, check the fuel pump and filter.

5. Inspect Fuel Injectors

• Remove the fuel injector connectors and check for proper voltage using a multimeter.
• If any injector is not functioning, replace it.
• Use an injector cleaning kit if necessary to clean clogged injectors.

6. Reconnect and Clear Codes

• Reconnect the MAF sensor, vacuum hoses, and fuel injectors.
• Reconnect the battery.
• Use the OBD-II scanner to clear the P0171 code and any other stored codes.