how to fix P0171 lean condition code in Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

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

2. Inspect and Replace Air Intake Components

• Sub-steps:
  1. Remove the air intake duct to access the MAF sensor.
  2. Inspect the duct for cracks or loose fittings; replace if damaged.
  3. Clean the MAF sensor using MAF sensor cleaner and let it dry.
  4. Reassemble the air intake duct securely.

3. Check and Replace Vacuum Hoses

• Sub-steps:
  1. Inspect all vacuum hoses for cracks or leaks.
  2. Replace any damaged hoses with OEM parts.
  3. Ensure all connections are tight to prevent air leakage.

4. Fuel System Inspection

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine; check the fuel pressure reading.
  3. If pressure is low, inspect the fuel pump and fuel filter; replace if necessary.
  4. If pressure is adequate, proceed to inspect the fuel injectors.

5. Clean or Replace Fuel Injectors

• Sub-steps:
  1. Remove fuel injectors from the fuel rail (ensure the fuel system is depressurized).
  2. Use an ultrasonic cleaner to clean the injectors or replace them if they are faulty.
  3. Reinstall the injectors and ensure they are seated properly.

6. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0171 code.
  3. Start the engine and monitor for any return of the check engine light.