why does my Honda Civic 10th Generation (2016-2021) keep throwing P0301 code

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Replace Spark Plugs

1. Remove the engine cover if necessary.
2. Disconnect the ignition coil connector and remove the ignition coil from cylinder 1.
3. Use a spark plug socket to remove the spark plug from cylinder 1.
4. Inspect the spark plug for signs of wear or fouling. Replace if needed.
5. Install the new spark plug, hand-tighten, then torque to manufacturer specifications (usually around 13-15 lb-ft).
6. Reinstall the ignition coil and reconnect its connector.

3. Test and Replace Ignition Coil

1. Swap the ignition coil from cylinder 1 with another cylinder (e.g., cylinder 2).
2. Clear the codes using the OBD-II scanner and run the engine.
3. If the P0301 code returns, the ignition coil is faulty and should be replaced.
4. Install the new ignition coil and reconnect the electrical connector.

4. Fuel Injector Inspection

1. Check the fuel injector connector for proper connection.
2. Use a multimeter to test the resistance of the fuel injector; it should typically be within the manufacturer's specifications.
3. If the injector is faulty, replace it with a new one.
4. Clean any debris from the injector port before installation.

5. Check for Vacuum Leaks

1. Inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
2. Use a smoke test or carburetor cleaner to identify any leaks around the intake manifold.
3. Replace or repair any faulty hoses or gaskets found during inspection.