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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect and Repair Air Intake System

• Tools Required: Vacuum gauge, hose clamps, screwdriver set
• Check all air intake hoses for cracks or loose connections. Tighten or replace as necessary.
• Use a vacuum gauge to check for vacuum leaks; repair any leaks found.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver set
• Disconnect the MAF sensor connector and remove it from the intake.
• Spray MAF sensor cleaner onto the sensor element (do not touch it) and allow it to dry.
• Reinstall the MAF sensor and reconnect the wiring harness.

4. Check Fuel System

• Tools Required: Fuel pressure gauge
• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition on (do not start) and check the fuel pressure. Compare it to manufacturer specifications.
• If the pressure is low, replace the fuel filter and check the fuel pump operation.

5. Inspect Exhaust System

• Tools Required: Socket set
• Visually inspect the exhaust system for any signs of leaks or damage, especially around the exhaust manifold and before the oxygen sensors.
• Repair any leaks found.

6. Clear Codes and Test Drive

• After repairs, use the OBD-II scanner to clear the P0171 code.
• Test drive the vehicle to ensure the issue is resolved and monitor for any reoccurrence of the check engine light.