how to troubleshoot the P0302 cylinder 2 misfire code in Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool before beginning work.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench.
• Remove the ignition coil from cylinder 2:
  1. Unplug the electrical connector.
  2. Remove the mounting bolts and lift the coil out.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear (burnt tip, carbon buildup).
• Replace with a new spark plug if necessary, ensuring it is gapped correctly.
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coil (if necessary)

• Tools Required: Multimeter.
• Test the ignition coil resistance with a multimeter:
  1. Measure primary resistance between terminals; consult specifications for the correct value.
  2. Measure secondary resistance.
• If the coil is out of specification, replace it with a new one.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Check Fuel Injector

• Tools Required: Noid light or multimeter.
• Remove the fuel injector connector for cylinder 2.
• Test the injector for proper operation:
  1. Connect the noid light to the injector connector.
  2. Crank the engine and check for light activation. If not firing, replace the fuel injector.
• Reconnect the injector harness after testing.

5. 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 and note the reading; compare to specifications.
• If compression is low, further investigation into piston rings or valves may be needed.