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

Solution

1. Preparation

• Gather tools and materials: OBD-II scanner, socket set, multimeter, MAF cleaner, cleaning cloths, vacuum gauge.
• Ensure the vehicle is parked on a level surface and set the parking brake.

2. Inspect Air Intake System

• Step 1: Visually inspect all hoses connected to the air intake for cracks or leaks.
• Step 2: Use a vacuum gauge to check for leaks in the intake manifold; replace any damaged hoses.
• Tools Required: Vacuum gauge, basic hand tools.

3. Clean or Replace MAF Sensor

• Step 1: Disconnect the MAF sensor connector.
• Step 2: Remove the MAF sensor from the air intake duct.
• Step 3: Spray MAF cleaner onto the sensor elements; let it dry completely before reinstalling.
• Step 4: Reinstall the MAF sensor and reconnect the electrical connector.
• Tools Required: MAF cleaner, socket set.

4. Check Fuel System

• Step 1: Connect a fuel pressure gauge to the fuel rail's test port.
• Step 2: Turn the ignition to the "ON" position without starting the engine and check the fuel pressure; it should meet manufacturer specifications.
• Step 3: If the pressure is low, inspect the fuel pump and filter; replace if necessary.
• Tools Required: Fuel pressure gauge.

5. Clean Throttle Body

• Step 1: Disconnect the throttle body from the intake manifold (remove bolts and electrical connectors).
• Step 2: Use throttle body cleaner and a cloth to clean the interior surfaces, especially around the throttle plate.
• Step 3: Reinstall the throttle body, ensuring all gaskets and connectors are secure.
• Tools Required: Throttle body cleaner, socket set.

6. Inspect Oxygen Sensors

• Step 1: Locate the upstream and downstream oxygen sensors on the exhaust system.
• Step 2: Check for any loose connections or damaged wiring.
• Step 3: Use a multimeter to test the sensor voltage output; replace any faulty sensors.
• Tools Required: Multimeter, socket set.