what does it mean when P0171 code shows up in my Honda CR-V Sixth Generation (2023-present)

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdriver, vacuum gauge
• Sub-steps:
  1. Visually inspect all air intake hoses and connections for cracks or loose fittings.
  2. Use a vacuum gauge to check for leaks in the intake manifold.
  3. Replace any damaged hoses or gaskets identified during the inspection.

3. Check and Clean MAF Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  1. Locate the MAF sensor, usually found between the air filter and the throttle body.
  2. Disconnect the electrical connector and remove the sensor from the air intake.
  3. Spray MAF sensor cleaner onto the sensor elements and allow it to dry completely before reinstallation.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail's test port.
  2. Turn the ignition to the "ON" position (do not start the engine) and observe the pressure reading.
  3. If the pressure is below manufacturer specifications, check the fuel pump and filter for issues.

5. Inspect and Test Oxygen Sensors

• Tools Required: Multimeter
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Use a multimeter to check the voltage output of the upstream oxygen sensor during idle and revving.
  3. Replace any malfunctioning sensors based on the readings.