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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery.
• Ensure the engine is cool before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdriver set, vacuum gauge
• Inspect the entire air intake system, including the air filter, MAF sensor, and intake hoses.
• Replace any damaged or cracked hoses.
• Clean the MAF sensor using specialized MAF sensor cleaner. Allow it to dry completely before reinstallation.

3. Fuel System Inspection

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition on (do not start the engine) and check the fuel pressure reading. It should match the manufacturer specifications (typically around 50-60 psi for RAV4).
• If the pressure is low, check the fuel pump and fuel filter for clogs or failures. Replace as necessary.

4. Vacuum Leak Repair

• Tools Required: Smoke machine (optional), hose clamps
• If any vacuum leaks are detected during inspection, replace or repair the faulty components.
• For small leaks, consider using hose clamps or silicone sealant to ensure a tight seal.

5. Reset the ECM

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0171 code from the ECM.
• Start the engine and allow it to reach operating temperature.