how to fix P0301 code in Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent any electrical shorts.
• Allow the engine to cool down before beginning work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil from cylinder one by unbolting it and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket and inspect it for wear, cracks, or carbon buildup.
• If damaged, replace with a new spark plug, ensuring it is gapped correctly according to the manufacturer’s specifications (typically around 0.043 inches for Honda).
• Apply dielectric grease to the spark plug boot and reinstall the ignition coil.

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• If the spark plug appears normal, check the ignition coil by swapping it with another cylinder while monitoring for changes in misfire codes.
• If the misfire moves to the swapped cylinder, replace the faulty ignition coil with a new one.
• Torque the ignition coil to the manufacturer’s specification (typically around 7.2 ft-lbs).

4. Check Fuel Injector

• Tools Required: Fuel injector cleaning kit, multimeter.
• Test the fuel injector for cylinder one using a multimeter to ensure it is receiving the correct voltage and is functioning properly.
• If the injector is faulty or clogged, remove and clean or replace it as necessary.

5. Address Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner.
• Inspect all vacuum lines and the intake manifold for leaks. Use a smoke machine to find leaks or spray carburetor cleaner around the intake while the engine is running to see if the idle changes.
• Repair or replace any damaged hoses or gaskets.