how to fix the misfire issue with my Honda Civic 10th Generation (2016-2021) showing P0302?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool and disconnect the battery.
• Wear safety gloves and goggles for protection.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the engine cover if applicable.
• Locate cylinder 2 spark plug (refer to engine layout).
• Use the spark plug socket to remove the spark plug.
• Inspect the spark plug for wear, carbon buildup, or damage.
• If necessary, replace with a new spark plug (use OEM specifications).
• Torque the spark plug to the manufacturer's specifications (typically 13 lb-ft).

3. Check and Replace Ignition Coil

• Tools Required: Ratchet and socket set.
• Disconnect the electrical connector from the ignition coil for cylinder 2.
• Remove the ignition coil by unscrewing the retaining bolts.
• Inspect for any signs of damage or carbon tracking.
• If faulty, replace with a new ignition coil.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect Fuel Injector

• Tools Required: Fuel injector removal tool (if needed).
• Locate the fuel injector for cylinder 2.
• Disconnect the electrical connector.
• Remove the fuel line carefully (use a rag to catch spills).
• Remove the injector and inspect for clogs or damage.
• If faulty or clogged, replace with a new fuel injector.
• Reinstall the injector, ensuring proper alignment and sealing.

5. Perform Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 2.
• Insert the compression gauge into the spark plug hole.
• Crank the engine to take a reading and note the value.
• Compare the reading with manufacturer specifications (typically around 180-200 psi).
• If compression is low, further diagnosis may be needed for internal engine issues.