how to fix P0301 misfire code in Honda Accord Eleventh Generation (2023-present)

Solution

1. Preparation

• Gather tools and safety equipment.
• Disconnect the negative battery terminal to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression gauge
• Multimeter
• Screwdrivers

2. Inspect and Replace Spark Plug

1. Remove the ignition coil cover.
2. Disconnect the ignition coil connector.
3. Remove the ignition coil using a socket.
4. Extract the spark plug using a spark plug socket.
5. Inspect the spark plug for wear or carbon buildup; replace if necessary.
   • Torque Specification: Install the new spark plug to 13 ft-lbs.
6. Reinstall the ignition coil and reconnect the connector.

3. Check and Replace Ignition Coil (if needed)

1. Use a multimeter to test the ignition coil's primary and secondary resistance.
   • Primary Resistance: Typically 0.4 - 2.0 ohms.
   • Secondary Resistance: Typically 6,000 - 15,000 ohms.
2. If the coil is out of spec, replace it with a new one.
3. Reinstall the ignition coil and cover.

4. Inspect and Clean Fuel Injector

1. Disconnect the fuel injector connector for cylinder 1.
2. Remove the fuel rail assembly to access the injector.
3. Inspect the injector for clogs or damage; clean or replace if necessary.
   • Use a fuel injector cleaning kit if cleaning.
4. Reinstall the fuel rail and reconnect the injector.

5. Perform Compression Test (if misfire persists)

1. Remove the spark plug for cylinder 1.
2. Insert the compression gauge into the spark plug hole.
3. Crank the engine for several seconds and note the reading.
   • Specification: Should be within the manufacturer's recommended range.
4. If compression is low, further diagnosis may be required for internal engine issues.