how to fix P0301 code in Honda Accord 9th Generation (2013-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery cable to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set (10mm and spark plug socket), torque wrench
• Remove the engine cover if applicable.
• Locate and remove the ignition coil by unscrewing the mounting bolt and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket and ratchet.
• Inspect the old spark plug for signs of wear (fouling, excessive gap).
• Install the new spark plug to the manufacturer’s torque specification (typically around 13 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil (if necessary)

• If the spark plug replacement did not resolve the issue, proceed to check the ignition coil.
• Swap the ignition coil from cylinder 1 with another cylinder and clear the codes.
• Monitor if the misfire code follows the ignition coil; if it does, replace the faulty coil.
• Reconnect everything as per the previous instructions.

4. Clean or Replace Fuel Injector (if necessary)

• Remove the fuel rail to access the fuel injector for cylinder 1.
• Clean the injector with a dedicated fuel injector cleaner or replace it if cleaning does not resolve the issue.
• Reinstall the fuel rail and ensure all connections are secure.

5. Compression Test (if necessary)

• If all previous steps have not resolved the issue, perform a compression test to check for internal engine issues.
• Remove the spark plug from cylinder 1 and install a compression tester.
• Crank the engine and record the compression reading; compare it with manufacturer specifications (typically around 180 psi).
• If compression is low, further diagnostic work may be required for potential internal repairs.