how to fix P0301 cylinder 1 misfire in Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

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

2. Replace Spark Plug

1. Remove the engine cover if applicable, using a socket set.
2. Disconnect the ignition coil connector from the cylinder 1 ignition coil.
3. Remove the ignition coil from cylinder 1 by unscrewing the bolts holding it in place.
4. Remove the spark plug from cylinder 1 using a spark plug socket.
5. Inspect the old spark plug; if it shows signs of wear or damage, replace it with a new spark plug (OEM specification recommended).
6. Install the new spark plug by hand, then tighten it to the manufacturer’s torque specifications (approximately 13 lb-ft or 17.6 Nm).
7. Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

1. If the ignition coil was found defective during diagnostics, remove the faulty ignition coil (follow the steps in Solution 2).
2. Install a new ignition coil for cylinder 1.
3. Reconnect the ignition coil connector.

4. Clean or Replace Fuel Injector (if necessary)

1. If the fuel injector is clogged, remove the fuel injector from cylinder 1.
2. Clean the injector using a specialized injector cleaning kit or replace it with a new one.
3. Reinstall the fuel injector ensuring proper seating and connection.