how to fix P0171 code on my Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and connections in the intake system for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to locate leaks by spraying near suspected areas; observe for changes in idle.
  3. Replace any damaged hoses or reconnect loose connections.

3. Clean the MAF Sensor

• Tools Required: Torx screwdriver, MAF sensor cleaner.
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor using a Torx screwdriver.
  3. Spray the MAF sensor with MAF sensor cleaner and allow it to dry completely.
  4. Reinstall the sensor and reconnect the electrical connector.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge to the test port.
  2. Turn the ignition to the "ON" position (do not start the engine) to check for pressure readings.
  3. Compare the readings with manufacturer specifications; if low, inspect the fuel pump and filter for issues.

5. Replace Faulty Components

• Sub-steps:
  1. If the fuel injectors are clogged, remove and clean them or replace them if necessary.
  2. Replace the engine coolant temperature sensor if it is faulty and giving incorrect readings.