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

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

• Sub-steps:
  1. Check the air filter and replace if dirty.
  2. Inspect all hoses and clamps for cracks or disconnections. Replace any faulty components.
  3. Clean the MAF sensor with MAF cleaner spray.
• Tools Required: Flathead screwdriver, MAF cleaner spray, replacement hoses if necessary.

3. Test and Repair Fuel System

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail and turn the ignition on (do not start the engine).
  2. Verify that the fuel pressure meets manufacturer specifications (typically 50-60 psi).
  3. If the pressure is low, inspect and replace the fuel pump or fuel filter as needed.
• Tools Required: Fuel pressure gauge, socket set for removing the fuel pump or filter.

4. Inspect and Repair PCV System

• Sub-steps:
  1. Locate the PCV valve and remove it from the valve cover.
  2. Check for clogs or damage and replace if necessary.
  3. Ensure that the PCV hose is free of cracks and securely attached.
• Tools Required: Pliers, replacement PCV valve if necessary.

5. Clear Codes and Test Drive

• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0171 code.
  3. Test drive the vehicle to confirm that the check engine light does not reappear.
• Tools Required: OBD-II scanner.