my Honda CR-V Fifth Generation (2017-2022) keeps throwing the P0171 code what should I do

Solution

1. Preparation

• Gather tools and parts needed: OBD-II scanner, fuel pressure gauge, multimeter, MAF sensor cleaner, and inspection tools.
• Ensure the vehicle is parked on a flat surface, and the engine is off.
• Disconnect the battery to prevent electrical shorts during repairs.

2. Inspect for Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum lines for cracks or disconnections.
  • Use a smoke machine or carburetor cleaner to identify leaks by spraying near suspected areas and watching for idle changes.
• Tools Required: Smoke machine or carburetor cleaner, flashlight.

3. Test Fuel Pressure

• Sub-steps:
  • Connect the fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position without starting the engine and check the pressure reading.
  • Compare the reading to manufacturer specifications (usually around 30-50 psi for CR-V).
• Tools Required: Fuel pressure gauge.

4. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor on the intake duct.
  • Disconnect the electrical connector and unscrew the sensor from the duct.
  • Clean the sensor element with MAF cleaner and let it dry.
  • Reinstall the sensor and reconnect the electrical connector.
• Tools Required: MAF sensor cleaner, screwdriver.

5. Inspect and Test Fuel Injectors

• Sub-steps:
  • Remove the fuel rail (ensure fuel pressure has been relieved).
  • Inspect injectors for clogs or leaks visually.
  • Use a multimeter to check the resistance of each injector (should be around 12-16 ohms).
• Tools Required: Multimeter, socket set.

6. Check Oxygen Sensors

• Sub-steps:
  • Locate the upstream and downstream oxygen sensors (typically on the exhaust manifold and catalytic converter).
  • Use a multimeter to check the voltage output of the upstream sensor while the engine is running (should oscillate between 0.1 and 0.9 volts).
• Tools Required: Multimeter, socket set.