how to fix P0171 code in Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, torque wrench, fuel pressure gauge, multimeter, basic hand tools.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Clean the MAF Sensor

• Remove the MAF sensor from the intake manifold.
• Use a MAF cleaner spray to clean the sensor.
• Allow it to dry completely before reinstalling.
• Reconnect the MAF sensor securely.

3. Check for Vacuum Leaks

• Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Use a smoke machine or carburetor cleaner around the intake manifold and hoses to identify leaks.
• Replace any damaged hoses or seals.

4. Test Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition key to the "ON" position without starting the engine to check the pressure.
• Compare the reading to the manufacturer’s specifications (typically between 50-60 psi for RAV4).
• If low, inspect the fuel pump and filter for faults.

5. Inspect Fuel Injectors

• Remove the fuel injectors for inspection.
• Check for clogs or leaks. Clean or replace if necessary.
• Ensure proper seating and connection when reinstalling.

6. Reset the ECM

• Reconnect the battery.
• Use an OBD-II scanner to clear the P0171 code.
• Take the vehicle for a test drive to ensure the issue is resolved.