how to fix P0301 misfire code in Honda Accord 8th Generation (2008-2012)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, fuel injector cleaner.
• Disconnect the negative terminal of the battery to ensure safety during repairs.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1.
• Unplug the electrical connector from the ignition coil.
• Unscrew the spark plug using a spark plug socket.
• Inspect the spark plug for wear, deposits, or damage. Replace if necessary.
• Install a new spark plug to the manufacturer's specified torque (typically 13-16 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coil (if required)

• If the spark plug is in good condition, test the ignition coil using a multimeter to check for proper resistance.
• If the coil is faulty, remove it and replace it with a new one.
• Ensure proper installation and connection of the ignition coil.

4. Fuel Injector Cleaning/Replacement

• If the ignition components are functional, inspect the fuel injector for cylinder 1.
• Use a fuel injector cleaner to clean the injector or replace it if it is clogged or malfunctioning.
• Reconnect fuel lines and ensure there are no leaks.

5. Compression Test

• If misfire persists, conduct a compression test on cylinder 1.
• If compression is below manufacturer specifications, further investigation into engine mechanical issues may be required (e.g., valve problems, piston rings).