how to fix P0302 misfire code in Honda Accord 8th Generation (2008-2012)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow the engine to cool down before beginning work.

2. Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector for cylinder 2.
  3. Unscrew and remove the ignition coil.
  4. Remove the spark plug using a socket wrench.
  5. Inspect the old spark plug for signs of fouling or damage.
  6. Install a new spark plug (NGK or Denso recommended) and torque to 13 lb-ft (17.6 Nm).
  7. Reinstall the ignition coil and reconnect the connector.

3. Check Ignition Coil

• Sub-steps:
  1. Test the ignition coil's resistance using a multimeter (primary: 0.4 - 2.0 ohms, secondary: 6.0 - 15.0 k-ohms).
  2. If out of specification, replace the ignition coil with a new one.
  3. Reassemble components and ensure all connections are secure.

4. Inspect Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 2.
  2. Test the injector with a multimeter for resistance (should be around 12-16 ohms).
  3. If the injector is faulty, replace it with a new one.
  4. Reconnect the fuel injector connector after replacement.

5. Compression Test

• Sub-steps:
  1. Remove spark plugs from all cylinders.
  2. Insert the compression gauge into the cylinder 2 spark plug hole.
  3. Crank the engine and record the compression reading (should be around 180 psi; consult service manual for specs).
  4. If compression is low, further investigation into valve seals or head gasket may be required.