how to fix P0171 code in my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Check the air intake hoses and connections for any cracks or loose fittings.
• Tighten or replace any faulty components.
• If vacuum leaks are found, replace the affected hoses and retest for leaks.

3. Clean MAF Sensor

• Tools Required: MAF sensor cleaner, soft cloth
• Remove the MAF sensor from the intake manifold.
• Spray the MAF sensor with MAF cleaner and allow it to dry completely.
• Reinstall the MAF sensor and ensure it is securely connected.

4. Inspect Fuel Delivery System

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the ON position (without starting the engine) and check the fuel pressure.
• If the pressure is below specifications, inspect the fuel pump and filter for blockages and replace as necessary.

5. Check Oxygen Sensor

• Tools Required: O2 sensor socket
• Locate the upstream oxygen sensor and use the O2 sensor socket to remove it.
• Test the sensor using a multimeter to ensure it’s within specifications.
• If it’s not functioning correctly, replace the oxygen sensor.