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

Solution

1. Preparation

• Gather tools and parts required for repairs.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake for cracks or disconnections.
  2. If any hoses are damaged, replace them with OEM parts.
  3. Check the intake manifold for any signs of leaks using a smoke test or by spraying carburetor cleaner around the joints while the engine is running.
  4. Tighten any loose manifold bolts to manufacturer specifications.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Remove the MAF sensor from the air intake duct.
  2. Spray MAF cleaner on the sensor elements; do not touch them.
  3. Allow the sensor to dry completely before reinstalling.
  4. Reinstall the MAF sensor and ensure all electrical connections are secure.

4. Test Fuel Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail service port.
  2. Turn the ignition to the "ON" position without starting the engine to check fuel pressure.
  3. Compare the reading against manufacturer specifications (typically around 40-50 psi).
  4. If pressure is low, inspect the fuel pump and fuel filter for issues.

5. Inspect and Clean Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail to access the injectors.
  2. Check each injector for clogs and clean them using an ultrasonic cleaner or injector cleaning kit.
  3. Reinstall the injectors, ensuring all seals are intact.
  4. Reconnect the fuel rail and ensure there are no leaks.

6. Replace Oxygen Sensor (if necessary)

• Sub-steps:
  1. If the oxygen sensor is faulty, disconnect the electrical connector and unscrew the sensor using an oxygen sensor socket.
  2. Install the new sensor and reconnect the electrical connector, ensuring a secure fit.