how to fix Honda Accord 8th Generation (2008-2012) with a P0302 engine code?

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel injector cleaner, and vacuum gauge.
• Ensure the vehicle is parked on a flat surface and the engine is cool.

2. Inspect and Replace Spark Plug

• Sub-steps:
  • Remove the engine cover if necessary.
  • Disconnect the negative battery terminal.
  • Remove the ignition coil from cylinder 2 by unscrewing it.
  • Remove the spark plug using a spark plug socket.
  • Inspect the spark plug for wear, carbon buildup, or damage; replace if necessary (use OEM specifications for size and type).
  • Reinstall the spark plug, ensuring it's torqued to 13 lb-ft (or manufacturer's specifications).
  • Reinstall the ignition coil.

3. Test and Replace Ignition Coil

• Sub-steps:
  • If swapping the ignition coil with another cylinder resolves the misfire, replace the faulty coil.
  • Disconnect the faulty ignition coil.
  • Install the new ignition coil, ensuring it is securely fastened and connected.

4. Check and Clean Fuel Injector

• Sub-steps:
  • Disconnect the fuel injector electrical connector.
  • Remove the fuel injector from cylinder 2 using a fuel injector puller if necessary.
  • Check for clogs or debris; clean using an appropriate fuel injector cleaner or replace with a new injector.
  • Reinstall the fuel injector and reconnect the electrical connector.

5. Compression Test

• Sub-steps:
  • Remove spark plugs from all cylinders.
  • Insert the compression tester into cylinder 2.
  • Crank the engine and record the compression reading. Compare it to the specifications (usually around 180 psi).
  • If the reading is low, further investigation into the valves or piston rings may be needed.