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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before starting work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect all air intake hoses for cracks or leaks.
  • Tighten any loose clamps and replace damaged hoses.
  • Inspect the air filter; replace if dirty or clogged.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Remove the electrical connector and the sensor itself.
  • Clean the sensor with MAF cleaner (do not touch the sensor element).
  • If damaged, replace with a new MAF sensor.

4. Check and Adjust Fuel System

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail.
  • Start the engine and observe fuel pressure; refer to service manual for specifications.
  • If pressure is low, check the fuel pump and replace if necessary.
  • Inspect fuel injectors; clean or replace as needed.

5. Address Vacuum Leaks

• Sub-steps:
  • Use smoke testing to identify vacuum leaks.
  • Replace any cracked or worn vacuum hoses.
  • Ensure all intake manifold bolts are properly torqued.