how to fix P0171 lean code on Honda CR-V Sixth Generation (2023-present)

Solution

1. Preparation

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

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks, tears, or disconnections.
  2. Use a smoke machine or carburetor cleaner to identify leaks by spraying around suspected areas.
  3. Replace any damaged hoses or fittings.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver
• Sub-steps:
  1. Locate the MAF sensor in the intake system.
  2. Disconnect the electrical connector and remove the sensor.
  3. Spray MAF sensor cleaner onto the sensor element and allow it to dry.
  4. Reinstall the sensor, reconnect the electrical plug, and ensure it is secured.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail test port and remove the cap.
  2. Connect the fuel pressure gauge to the test port.
  3. Turn the ignition to the "ON" position (do not start the engine) to check pressure.
  4. Compare the reading to manufacturer specifications. If low, inspect the fuel pump and filter.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaning kit or replacement injectors
• Sub-steps:
  1. Disconnect the fuel injector connectors and remove the injectors from the fuel rail.
  2. Inspect the injectors for clogs or physical damage.
  3. Clean the injectors using a cleaning kit or replace them if necessary.
  4. Reinstall the injectors and reconnect the connectors.

6. Verify Engine Coolant Temperature Sensor

• Sub-steps:
  1. Locate the engine coolant temperature sensor.
  2. Disconnect the sensor and check its resistance with a multimeter according to specifications.
  3. Replace the sensor if it is out of specification.