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

Solution

1. Preparation

• Gather necessary tools and parts. Ensure the engine is cold before starting.
• Tools required: Socket set, torque wrench, multimeter, compression gauge, OBD-II scanner.

2. Replace Spark Plug

• Remove the engine cover if necessary.
• Disconnect the ignition coil connector for cylinder 2.
• Remove the ignition coil from cylinder 2 by unscrewing the mounting bolts.
• Remove the spark plug using a spark plug socket.
• Install the new spark plug, ensuring the gap is set to manufacturer specifications (typically 0.043 inches for Honda vehicles).
• Reinstall the ignition coil and reconnect the connector.

3. Test Ignition Coil

• If the spark plug replacement does not resolve the issue, test the ignition coil.
• Use a multimeter to measure the primary and secondary resistance of the ignition coil. Refer to the specifications in the service manual (typically around 0.4 to 0.6 ohms for primary and 10,000 to 15,000 ohms for secondary).
• Replace the ignition coil if it falls outside the specified range.

4. Inspect Fuel Injector

• If issues persist, check the fuel injector for cylinder 2.
• Disconnect the fuel injector connector and remove the injector using the appropriate tools.
• Clean the injector with a dedicated cleaner or replace it if it’s malfunctioning.

5. Perform Compression Test

• If all else fails, perform a compression test on cylinder 2.
• Remove the spark plug and insert the compression gauge.
• Crank the engine for a few seconds and record the compression reading.
• Compare the reading to the manufacturer specifications (typically 180-220 psi). Replace the head gasket or repair cylinder if compression is low.