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

Solution

1. Preparation

• Tools Required: OBD-II scanner, vacuum gauge, fuel pressure gauge, multimeter, socket set, MAF sensor cleaner.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Vacuum Leaks

• Use a vacuum gauge to check for proper vacuum levels.
• Visually inspect all vacuum hoses for cracks or disconnections.
• If leaks are found, replace or repair the affected hoses.

3. Check and Adjust Fuel Pressure

• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition key to the "on" position without starting the engine and check the pressure reading.
• If the pressure is below specifications (usually around 30-50 psi for most Honda models), inspect the fuel pump and filter. Replace as needed.

4. Clean or Replace MAF Sensor

• Locate the MAF sensor in the air intake system.
• Disconnect the electrical connector.
• Remove the MAF sensor using the appropriate socket.
• Clean the sensor wires with MAF sensor cleaner.
• If heavily damaged or unable to clean, replace the MAF sensor with a new one.

5. Inspect and Test Fuel Injectors

• Disconnect the fuel injector connectors.
• Use a multimeter to check the resistance of the injectors. Compare readings to manufacturer specifications.
• If any injector is out of spec, replace it with a new one.

6. Check O2 Sensors

• Inspect the upstream oxygen sensor for proper operation and connection.
• Replace the oxygen sensor if it is faulty or if error codes indicate a problem.