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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Tools Required: Vacuum gauge, screwdriver set.
• Check all hoses and connections in the air intake system for leaks.
  • Sub-step 1: Use the vacuum gauge to check for leaks in hoses and gaskets.
  • Sub-step 2: Replace any damaged hoses or gaskets found during inspection.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner spray, torx screwdriver.
• If the MAF sensor is dirty:
  • Sub-step 1: Remove the MAF sensor from the air intake duct.
  • Sub-step 2: Spray MAF cleaner on the sensor elements and allow it to dry.
• If damaged, replace the MAF sensor with a new one.

4. Test and Replace Fuel Pump (if necessary)

• Tools Required: Fuel pressure gauge.
• Check fuel pressure according to manufacturer specifications.
  • Sub-step 1: Connect the fuel pressure gauge to the fuel rail.
  • Sub-step 2: Start the engine and observe the pressure reading.
  • Sub-step 3: If pressure is low, replace the fuel pump.

5. Clean or Replace Fuel Injectors

• Tools Required: Fuel injector cleaning kit or replacement injectors.
• If injectors are clogged:
  • Sub-step 1: Remove the fuel injectors from the fuel rail.
  • Sub-step 2: Use a cleaning kit to clean the injectors or replace them if they are damaged.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0171 code and any other stored codes.