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

Solution

1. Preparation

• Gather tools and required parts.
• Ensure the car is parked on a flat surface, and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, ratchet, spark plug socket, torque wrench.
• Remove the ignition coil cover if applicable, using the socket set.
• Disconnect the electrical connector from the ignition coil on cylinder 1.
• Remove the ignition coil using the socket.
• Unscrew the spark plug using the spark plug socket.
• Inspect the old spark plug for wear and replace it with a new one, ensuring it is gapped properly.
• Torque the new spark plug to manufacturer specifications (typically around 13-16 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Test Ignition Coil

• Check the ignition coil for cylinder 1 for any visible cracks or signs of wear.
• If necessary, replace the ignition coil with a new one.
• Reconnect all components and ensure proper seating.

4. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine.
• Record the compression reading and compare it with manufacturer specifications (typically around 180 psi).
• If the compression is low, further investigation may be needed for internal engine issues.

5. Inspect Fuel Injector

• Tools Required: Fuel injector cleaning kit (if cleaning), replacement injector (if necessary).
• Disconnect the fuel line (with caution, as fuel may spray).
• Remove the fuel injector from cylinder 1.
• Inspect for clogs or leaks. Clean the injector using a cleaning kit or replace it with a new one if defective.
• Reinstall the fuel injector and reconnect the fuel line.