how to fix P0171 code in Toyota Camry XV70 (2018-2024)?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety during the repair process.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses for cracks or disconnections.
  • Use a smoke machine to detect leaks in the intake system.
  • Replace any damaged hoses or components.
• Tools Required: Smoke machine, basic hand tools.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Disconnect the electrical connector and remove the sensor.
  • Clean the MAF sensor using MAF cleaner spray. Allow it to dry.
  • If cleaning does not resolve the issue, replace the sensor with a new one.
• Tools Required: Screwdriver set, MAF cleaner spray.

4. Check and Repair Fuel System

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the ON position (do not start) and check the fuel pressure against specifications.
  • If pressure is low, inspect the fuel pump and filter for clogs or defects and replace as necessary.
• Tools Required: Fuel pressure gauge, basic hand tools.

5. Clean Throttle Body

• Sub-steps:
  • Remove the air intake duct to access the throttle body.
  • Use throttle body cleaner and a soft cloth to clean the throttle plate and surrounding areas.
  • Reassemble the intake duct and reconnect all hoses.
• Tools Required: Throttle body cleaner, soft cloth, screwdriver set.