what does it mean if my Toyota Camry Eighth Generation (2018-present) has a P0171 code?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow the engine to cool before beginning work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect the air intake hoses for cracks or loose fittings.
  • Replace any damaged hoses or clamps.
  • Check the intake manifold gasket for leaks and replace if necessary.

3. Test and Repair Fuel Delivery System

• Sub-steps:
  • Connect the fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "On" position (without starting) and check for adequate pressure (refer to the specifications for your model).
  • If pressure is low, inspect the fuel pump, fuel filter, and fuel line for blockages or failures. Replace components as necessary.

4. Clean or Replace MAF Sensor

• Sub-steps:
  • Disconnect the electrical connector from the MAF sensor.
  • Remove the MAF sensor from the air intake.
  • Clean the sensor using MAF cleaner spray (avoid using other cleaners).
  • Reinstall the sensor and reconnect the electrical connector.

5. Inspect and Clean Fuel Injectors

• Sub-steps:
  • Remove the fuel injectors from the fuel rail.
  • Inspect for carbon buildup and clean them using an ultrasonic cleaner or fuel injector cleaner.
  • Replace any faulty injectors with new units.

6. Test and Replace Oxygen Sensors (if necessary)

• Sub-steps:
  • Use a multimeter to test the oxygen sensor's voltage output.
  • If the sensor is out of specification, replace it with a new one.
  • Reconnect all electrical connectors and clear the error codes from the ECM.