how to fix P0171 code in my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to identify any leaks around the intake manifold and vacuum lines.
  3. Replace any damaged hoses or gaskets with OEM parts.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Remove the MAF sensor from the air intake duct.
  2. Use MAF sensor cleaner to gently clean the sensor elements. Allow it to dry completely.
  3. Reinstall the MAF sensor ensuring all connectors are secure. If damaged, replace with a new sensor.

4. Check and Replace Fuel Filter (if necessary)

• Sub-steps:
  1. Locate the fuel filter and relieve fuel pressure by removing the fuel pump fuse and running the engine until it stalls.
  2. Disconnect fuel lines from the filter and replace the fuel filter with a new one.
  3. Reconnect fuel lines and reinsert the fuel pump fuse.

5. Test Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail to access the injectors.
  2. Inspect each injector for leaks or clogs. Clean or replace any faulty injectors.
  3. Reassemble the fuel rail and ensure proper sealing.