how to fix the P0171 code in my Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, flashlight
• Inspect the air intake hose for cracks or damage.
  • Tighten any loose clamps or replace damaged hoses.
• Check the air filter and replace it if clogged.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, torx driver
• Remove the MAF sensor from the air intake system.
  • Use the MAF sensor cleaner to clean the sensor elements.
  • Allow it to dry completely before reinstalling.
• If the MAF sensor is faulty, replace it with a new one.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Attach the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (do not start the engine) and check the fuel pressure.
  • If the pressure is below specifications, check the fuel pump and filter.
  • Replace the fuel pump or filter if necessary.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaning kit (if cleaning), replacement injectors (if faulty)
• Test the fuel injectors for proper operation.
  • If they are clogged, use an injector cleaning kit or replace them if they are malfunctioning.

6. Check Vacuum Lines

• Tools Required: Visual inspection tools (flashlight)
• Inspect all vacuum lines for leaks or damage.
  • Replace any damaged lines and ensure all connections are secure.