my Honda Civic 10th Generation (2016-2021) has a check engine light with code P0302, what should I d...

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plug

1. Remove the engine cover (if applicable) using a socket set.
2. Disconnect the ignition coil wiring harness on cylinder 2.
3. Remove the ignition coil using a socket wrench.
4. Remove the spark plug using a spark plug socket.
5. Inspect the spark plug for wear, carbon buildup, or damage; replace if necessary.
   • Parts Required: New spark plug (OEM recommended).
6. Install the new spark plug and torque it to the manufacturer's specification (typically 13-16 lb-ft).
7. Reinstall the ignition coil and reconnect the wiring harness.

3. Inspect and Replace Fuel Injector (if necessary)

1. Disconnect the fuel injector wiring harness for cylinder 2.
2. Remove the fuel rail (if necessary) to access the fuel injector.
3. Carefully pull out the fuel injector from the rail.
4. Inspect the injector for clogging or malfunction; replace with a new fuel injector if needed.
   • Parts Required: New fuel injector (OEM recommended).
5. Reinstall the fuel injector and reconnect the wiring harness.

4. Compression Test (if misfire persists)

1. Remove the spark plug from cylinder 2 (refer back to step in section 2).
2. Connect the compression gauge to the spark plug hole.
3. Crank the engine several times and record the pressure.
4. Compare the compression reading to the manufacturer's specifications.
5. If the compression is low, further diagnostics may be needed for internal engine components.