how to fix the P0171 code on my Toyota Corolla E210 (2019-2024)?

Solution

1. Preparation

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

2. Inspect and Clean the MAF Sensor

• Remove the MAF sensor from the air intake duct.
• Use MAF sensor cleaner to gently clean the sensor elements.
• Allow the sensor to dry completely before reinstallation.

3. Check and Repair Vacuum Leaks

• Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Replace any damaged hoses with new ones.
• Use a smoke machine or carburetor cleaner to locate any hidden leaks.

4. Fuel System Inspection

• Connect a fuel pressure gauge to the fuel rail to check fuel pressure.
• If the pressure is below specifications (consult manufacturer specifications for the correct range), check the fuel pump and filter.
• Replace the fuel filter if clogged and ensure the fuel pump is functioning correctly.

5. Replace Fuel Injectors (if necessary)

• If fuel injectors are identified as faulty, remove the fuel rail and replace the injectors with new ones.
• Ensure proper seating and sealing of injectors to prevent leaks.

6. Clear Codes and Test Drive

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0171 code.
• Start the engine and observe for any warning lights.
• Take the vehicle for a test drive to ensure the issue is resolved.