how to fix P0301 misfire code in Honda Civic 9th Generation (2012-2015)

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the negative battery terminal to avoid electrical shorts during repair.

2. Remove the Spark Plug

• Use a spark plug socket and ratchet to remove the spark plug from cylinder 1.
• Inspect the spark plug for signs of wear, fouling, or damage.
• Tools Required: Spark plug socket, ratchet

3. Inspect and Replace the Ignition Coil

• Disconnect the ignition coil connector and remove the mounting bolts.
• Replace the ignition coil with a new one if defective, or reinstall if functional.
• Tools Required: Socket set, torque wrench
• Safety Warning: Ensure the ignition system is off before handling ignition components.

4. Check and Clean Fuel Injector

• Remove the fuel rail to access the injector for cylinder 1.
• Test the injector operation with a noid light or multimeter; replace if faulty.
• Clean the injector using a fuel injector cleaner or ultrasonic cleaner if necessary.
• Tools Required: Fuel injector cleaner, socket set

5. Perform a Compression Test

• Remove the spark plug and insert the compression tester into cylinder 1.
• Crank the engine and record the compression reading; replace head gasket if low.
• Tools Required: Compression tester