how to fix P0301 code on Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before proceeding.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug gap tool.
• Remove the engine cover if applicable.
• Use a socket to remove the spark plug from Cylinder 1 (refer to the owner's manual for the exact location).
• Inspect the spark plug for signs of wear or damage (carbon buildup, electrode wear).
• If necessary, replace the spark plug with a new one, ensuring the gap is set to the manufacturer's specifications (usually around 0.044 inches for Honda).
• Torque the new spark plug to the recommended specification (typically around 13 lb-ft).

3. Check and Replace Ignition Coil

• Tools Required: Socket set.
• Disconnect the electrical connector from the ignition coil on Cylinder 1.
• Remove the ignition coil bolt using a socket.
• Gently pull the ignition coil out of the cylinder head and inspect for cracks or signs of arcing.
• If defective, install a new ignition coil and secure it with the bolt. Reconnect the electrical connector.

4. Test and Clean Fuel Injector

• Tools Required: Noid light or multimeter, fuel injector cleaner (if applicable).
• Disconnect the fuel injector connector on Cylinder 1.
• Use a noid light to check for pulse signal to the injector. If no pulse, further investigate wiring or ECU issues.
• If the injector is functioning but clogged, use a fuel injector cleaning kit to clean it appropriately.
• Reconnect the injector connector after testing or cleaning.

5. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from Cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine for a few seconds and read the compression value.
• Compare the result with the manufacturer's specifications (typically around 180 psi). If the compression is low, further investigation is needed for internal engine issues.