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

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visual inspection of the air intake hose for cracks or loose fittings.
  2. If a leak is found, replace the damaged hose or secure loose connections.
  3. Check vacuum hoses connected to the intake manifold for any signs of wear or damage.
  4. Replace any defective vacuum hoses.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake system.
  2. Disconnect the electrical connector and remove the MAF sensor.
  3. Clean the sensor using MAF cleaner spray. Do not touch the sensor elements directly.
  4. If the sensor is damaged, replace it with a new one.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position (without starting the engine) to check fuel pressure.
  3. Compare the reading to manufacturer specifications (usually around 50-60 psi).
  4. If pressure is low, inspect the fuel pump and filter, replacing components as necessary.

5. Inspect and Clean Fuel Injectors

• Sub-steps:
  1. Remove the fuel injectors from the fuel rail (follow specific procedures for your model).
  2. Use an injector cleaning kit or ultrasonic cleaner to clean the injectors.
  3. Reinstall the cleaned or new injectors, ensuring proper sealing.
  4. Reconnect the fuel rail and ensure all connections are secure.