what does the P0171 code mean for my Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow the engine to cool if it has been running.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the air intake hose for cracks or loose connections.
  2. Replace any damaged hoses or clamps.
  3. Ensure that the air filter is clean and replace it if necessary.

3. Clean or Replace the MAF Sensor

• Sub-steps:
  1. Remove the MAF sensor from the air intake duct (use a Torx or Phillips screwdriver).
  2. Clean the sensor with MAF cleaner spray (do not touch the sensor element).
  3. Reinstall the sensor and ensure all electrical connections are secure; replace if cleaning does not improve functionality.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition on without starting the engine and check the pressure reading (it should meet manufacturer specifications, typically around 30-50 psi).
  3. If pressure is low, inspect the fuel pump, fuel filter, and fuel injectors for issues and replace as necessary.

5. Inspect and Test Oxygen Sensors

• Sub-steps:
  1. Locate the upstream (pre-catalytic converter) oxygen sensor.
  2. Use a multimeter to check the sensor's voltage output while the engine is running (it should fluctuate between 0.1 to 0.9 volts).
  3. Replace the sensor if it is outside the specified range.