how to fix the P0171 code on my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Remove the air intake duct and inspect for cracks or loose fittings.
• If any damage is found, replace the air intake duct.
• Reinstall the intake duct securely and ensure all clamps are tightened.

3. Clean or Replace MAF Sensor

• Locate the MAF sensor in the air intake path.
• Disconnect the sensor's electrical connector.
• Use MAF sensor cleaner to spray the sensing element and avoid touching it.
• Allow the sensor to dry completely before reinstallation.
• If damaged, replace the MAF sensor with a new one.

4. Check and Repair Fuel System

• Use a fuel pressure gauge to check the fuel pressure against specifications (typically around 50-60 psi for RAV4).
• If pressure is low, inspect the fuel pump and replace it if necessary.
• Check the fuel filter for clogs and replace if it's due for service.

5. Inspect Vacuum Lines

• Inspect all vacuum hoses for cracks or disconnections.
• Replace any damaged vacuum hoses to ensure proper pressure within the intake manifold.

6. Reassemble and Test

• Reconnect the battery.
• Start the engine and let it reach operating temperature.
• Clear the P0171 code using the OBD-II scanner.
• Test drive the vehicle to ensure the check engine light does not reappear.