how to fix Honda Accord 10th Generation (2018-2022) engine misfire code P0302

Solution

1. Preparation

• Gather tools and parts required.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical short-circuits.

2. Inspect and Replace Spark Plug (if needed)

• Remove the ignition coil cover if applicable.
• Disconnect the wiring harness from the ignition coil for cylinder 2.
• Remove the ignition coil using a socket set.
• Inspect the spark plug; if it is worn or damaged, replace it.
  • Tools Required: Socket set, torque wrench
  • Safety Warning: Ensure the engine is cool to avoid burns.
• Install the new spark plug, torquing it to the manufacturer’s specification (typically around 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the wiring harness.

3. Inspect and Clean/Replace Fuel Injector

• Disconnect the fuel injector connector for cylinder 2.
• Remove the fuel rail (if necessary) to access the injector.
• Inspect the injector for clogs or damage; clean or replace as needed.
  • Tools Required: Fuel injector cleaning kit, O-ring lubricant
• If replacing, ensure to use new O-rings and seat the injector properly in the rail.

4. Check Compression (if misfire persists)

• Remove the spark plugs from the engine.
• Insert a compression gauge into cylinder 2.
• Crank the engine and record the compression reading; it should meet manufacturer specifications (typically around 190-215 psi).
  • Tools Required: Compression gauge
• If compression is low, investigate potential causes such as valve issues or head gasket failure.

5. Reassemble and Test

• Reinstall all components in reverse order.
• Reconnect the negative battery terminal.
• Start the engine and check for proper operation and absence of misfire codes.