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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down completely before starting work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the air intake ducts for any cracks or loose fittings.
  2. Tighten any loose clamps and replace damaged hoses.
  3. Check the throttle body for dirt buildup and clean it if necessary.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the intake duct.
  3. Spray the MAF sensor with MAF cleaner and let it dry completely.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel System

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel pressure test port on the fuel rail.
  2. Attach the fuel pressure gauge and turn the ignition to the "ON" position without starting the engine.
  3. Check the fuel pressure reading against manufacturer specifications (should be around 30-40 psi).
  4. If pressure is low, inspect the fuel pump and filter for issues.

5. Inspect and Clean Fuel Injectors

• Tools Required: Injector cleaning kit or replacement injectors
• Sub-steps:
  1. Remove the fuel rail with the injectors attached.
  2. If cleaning, connect the injector cleaning kit and follow the manufacturer’s instructions.
  3. If replacing, install new fuel injectors and ensure they are properly seated.

6. Check Engine Coolant Temperature Sensor

• Sub-steps:
  1. Locate the coolant temperature sensor (usually near the thermostat housing).
  2. Disconnect the electrical connector and remove the sensor.
  3. Test the sensor's resistance with a multimeter and compare it to specifications.
  4. Replace the sensor if it is out of range.