how to deal with the P0171 code on my Toyota RAV4 Fourth Generation (2013-2018)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Vacuum Hoses

• Inspect all vacuum hoses connected to the intake system for cracks or disconnections.
• Replace any damaged hoses with OEM or high-quality aftermarket parts.
• Reconnect all hoses securely.

3. Clean or Replace MAF Sensor

• Locate the MAF sensor, typically found between the air filter and throttle body.
• Disconnect the electrical connector and remove the MAF sensor from the housing.
• Clean the MAF sensor using MAF sensor cleaner; do not touch the sensor elements.
• If cleaning does not resolve the issue, replace the MAF sensor.

4. Fuel System Inspection

• Attach a fuel pressure gauge to the fuel rail test port.
• Start the engine and monitor the fuel pressure; it should match the specifications in the service manual (usually between 30-50 psi).
• If the pressure is low, check the fuel pump and fuel filter for issues and replace as necessary.

5. Check for Intake Leaks

• Visually inspect the intake manifold gasket for any signs of wear or leaks.
• If leaks are found, replace the intake manifold gasket with a new OEM part.
• Ensure all bolts are torqued to the manufacturer’s specifications.

6. Reassemble and Reconnect

• Reinstall any components removed during the inspection and repair process.
• Reconnect the negative battery terminal.