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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Remove the engine cover (if applicable).
  • Visually inspect the air intake hoses and connections for cracks or looseness.
  • Replace any damaged hoses or clamps.
  • Recheck for air leaks after repairs.

3. Clean or Replace the MAF Sensor

• Sub-steps:
  • Disconnect the MAF sensor connector.
  • Remove the MAF sensor from the air intake tube.
  • Clean the MAF sensor using a specialized MAF cleaner and allow it to dry.
  • If cleaning does not resolve the issue, replace the MAF sensor with a new one.
  • Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  • Locate the fuel pressure test port on the fuel rail.
  • Connect a fuel pressure gauge to the test port.
  • Start the engine and monitor the fuel pressure; it should be within manufacturer specifications (usually around 40-50 psi).
  • If pressure is low, inspect the fuel pump and fuel filter for issues, and replace as needed.

5. Inspect Fuel Injectors

• Sub-steps:
  • Disconnect the fuel injector connectors.
  • Use an ohmmeter to check the resistance of each injector; it should be within the specified range (typically around 12-16 ohms).
  • If any injectors are faulty, replace them with new ones.
  • Reconnect all electrical connectors.

6. Reassemble and Reconnect Battery

• Reinstall any removed components in reverse order.
• Reconnect the battery terminals.
• Clear the codes using an OBD-II scanner.