how to fix P0171 code in Toyota Corolla E210 (2019-2024)?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Park the vehicle on a level surface, turn off the ignition, and disconnect the battery.

2. Inspect and Replace Air Intake Components

1. Check Air Filter:

   • Remove the air filter from the air intake box.
   • Inspect for dirt and debris; replace if necessary.

2. Inspect Intake Hoses:

   • Visually check intake hoses for cracks or wear.
   • Replace any damaged hoses.

3. Clean MAF Sensor:

   • Disconnect the MAF sensor electrical connector.
   • Use MAF cleaner to spray the sensor elements carefully.
   • Reconnect the sensor after cleaning.

3. Fuel System Check

1. Check Fuel Pressure:

   • Connect the fuel pressure gauge to the fuel rail.
   • Start the engine and observe the fuel pressure reading; it should be within manufacturer specifications (typically 43-50 PSI).
   • If low, inspect the fuel pump and replace if faulty.

2. Inspect Fuel Injectors:

   • Remove the fuel rail and inspect each injector for clogs.
   • Clean or replace any clogged or leaking injectors.

4. Vacuum Leak Repair

• Inspect all vacuum lines for integrity.
• Replace any damaged vacuum lines to ensure a proper air-fuel mixture.

5. Reassembly and Testing

• Reassemble any components removed during inspection.
• Reconnect the battery and clear the codes using the OBD-II scanner.