how to diagnose a misfire in Honda Accord Eleventh Generation (2023-present) with code P0302?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.
• Allow the engine to cool down before starting the repair.

2. Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench.
• Remove the ignition coil from cylinder 2 by unbolting and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket. Inspect the old spark plug for wear or fouling.
• Install the new spark plug by hand, then torque it to the manufacturer’s specifications (typically 13-16 lb-ft).
• Reinstall the ignition coil and secure it properly.

3. Inspect and Replace Ignition Coil (if necessary)

• If the spark plug was in good condition, proceed to check the ignition coil.
• Use a multimeter to check the coil’s resistance; compare with manufacturer specifications.
• If the coil is faulty, remove it and replace it with a new one, ensuring it is properly connected.

4. Test Fuel Injector

• If the ignition components are fine, check the fuel injector for cylinder 2.
• Remove the fuel injector connector and use a noid light to check for signal.
• If the noid light does not illuminate, inspect wiring and connectors. If the injector is faulty, replace it.

5. Compression Test

• If issues persist, perform a compression test on cylinder 2.
• Remove the spark plug and connect the compression tester.
• Crank the engine and record the compression reading. Compare it with specifications (usually around 180 psi).
• If compression is low, further investigation (valve adjustment or head gasket check) is required.