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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the ignition coil from cylinder 2.
  2. Extract the spark plug using a spark plug socket and ratchet.
  3. Inspect the spark plug for wear; replace if worn or fouled.
  4. Install a new spark plug, ensuring it is gapped correctly (typically 0.044 inches for Honda).
  5. Reattach the ignition coil securely.

3. Test and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. Swap the ignition coil from cylinder 2 with another cylinder (e.g., cylinder 1).
  2. Clear the error codes using the OBD-II scanner.
  3. Start the engine and check for new misfire codes. If P0302 reappears, replace the ignition coil with a new one.
  4. Install the new ignition coil and ensure proper connections.

4. Inspect and Replace Fuel Injector (if necessary)

• Sub-steps:
  1. Remove the fuel injector connector and the retaining clips.
  2. Extract the fuel injector from cylinder 2.
  3. Test the fuel injector using a multimeter; replace if it does not meet specifications.
  4. Install a new fuel injector with proper O-ring lubrication.
  5. Reconnect the fuel injector and ensure secure connections.

5. Perform Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 2.
  2. Insert compression gauge into the spark plug hole.
  3. Crank the engine and record the compression reading; it should typically be above 180 psi.
  4. If compression is low, investigate further for potential head gasket failure or valve issues.

Tools Required:

• OBD-II scanner
• Socket set
• Spark plug socket
• Torque wrench
• Compression gauge
• Multimeter
• Noid light (for fuel injector testing)
• Ratchet and extension

Parts Required:

• Spark plug (specific for Honda Accord)
• Ignition coil (if needed)
• Fuel injector (if needed)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on ignition components.
• Allow the engine to cool before performing any repairs to avoid burns.