how to fix Honda Civic 10th Generation (2016-2021) P0302 code for cylinder 2 misfire

Solution

1. Preparation

• Gather all necessary tools and parts before starting the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if necessary.
• Locate cylinder 2 spark plug (usually the second plug from the timing belt side).
• Use the spark plug socket to remove the old spark plug.
• Inspect the spark plug for wear, carbon buildup, or damage.
• If necessary, replace with a new spark plug, ensuring the correct gap (typically 0.028-0.031 inches for Honda).
• Torque the new spark plug to manufacturer specifications (usually around 13 lb-ft).

3. Check and Replace Ignition Coil

• Tools Required: Socket set, multimeter.
• Disconnect the electrical connector from the ignition coil in cylinder 2.
• Remove the ignition coil by unscrewing the retaining bolts.
• Use a multimeter to test the coil for proper resistance (typically around 0.6-0.8 ohms for primary and 10-15 kohms for secondary).
• Replace the ignition coil if it is faulty or perform a swap with another cylinder to test.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect and Test Fuel Injector

• Tools Required: Fuel injector cleaning kit (optional), multimeter.
• Disconnect the fuel injector connector for cylinder 2.
• Use a multimeter to check for voltage at the connector while cranking the engine.
• If no voltage, inspect wiring and connectors for damage.
• If voltage is present, consider removing the fuel injector for cleaning or replacement.
• Reinstall the fuel injector and reconnect the connector.

5. Conduct Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 2.
• Insert the compression tester into the spark plug hole.
• Crank the engine a few times and record the compression reading.
• Compare with manufacturer specifications (typically around 180-200 psi).
• If compression is low, further investigation into piston rings or valves is required.