how to fix P0171 code in Toyota RAV4 XA40 (2013-2018)

Solution

1. Preparation

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

2. Inspect and Repair Vacuum Leaks

• Inspect all vacuum hoses connected to the intake manifold for signs of wear or cracks.
• Replace any damaged hoses with new ones.
• Check intake manifold gaskets for leaks; replace if necessary.

3. Clean or Replace MAF Sensor

• Remove the MAF sensor from the air intake duct.
• Use MAF cleaner to clean the sensor thoroughly. Avoid touching the sensor element.
• If the sensor is faulty, replace it with a new one.

4. Check Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (do not start the engine) and check the pressure.
• Compare the reading to manufacturer specifications; if low, replace the fuel pump or filter as necessary.

5. Inspect Throttle Body

• Remove the throttle body from the intake manifold.
• Clean the throttle body with throttle body cleaner and inspect for carbon buildup.
• Reinstall the throttle body using new gaskets.

6. Replace Oxygen Sensors (if necessary)

• If oxygen sensor readings are out of range, remove the faulty sensors using an oxygen sensor socket.
• Install new oxygen sensors and ensure they are torqued to manufacturer specifications.