how to fix P0171 code on my Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before beginning work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps.
• Sub-steps:
  1. Use a vacuum gauge to check for normal vacuum readings.
  2. Inspect all vacuum hoses for cracks or disconnections.
  3. Replace any damaged hoses and ensure all connections are secure.

3. Test and Replace MAF Sensor (if necessary)

• Tools Required: Multimeter, MAF cleaner.
• Sub-steps:
  1. Remove the MAF sensor from the intake duct.
  2. Clean the sensor with MAF cleaner to remove any dirt or debris.
  3. Reinstall the sensor and check readings with a multimeter; replace it if readings are out of range.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the ON position (do not start the engine) and check the pressure reading.
  3. If the pressure is low, check the fuel pump and filter for issues. Replace them if necessary.

5. Inspect Fuel Injectors

• Tools Required: Fuel injector cleaner, multimeter.
• Sub-steps:
  1. Remove the fuel injector rail to access the injectors.
  2. Inspect injectors for clogs; use a fuel injector cleaner to clean them.
  3. Test each injector's resistance with a multimeter; replace any that are faulty.