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

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, multimeter, compression tester, torque wrench, vacuum gauge, and a smoke machine (if available).
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Replace Spark Plug

• Step 1: Remove the engine cover if applicable.
• Step 2: Disconnect the ignition coil connector on cylinder 1.
• Step 3: Remove the ignition coil using a socket set.
• Step 4: Remove the spark plug using a spark plug socket.
• Step 5: Inspect the spark plug for wear. If damaged, replace it with a new one, ensuring it meets OEM specifications.
• Step 6: Reinstall the ignition coil and reconnect the connector. Replace the engine cover.

3. Replace Ignition Coil (if necessary)

• Step 1: If the spark plug is fine, proceed to check the ignition coil.
• Step 2: Use a multimeter to check the resistance of the ignition coil. Replace if out of specification.
• Step 3: Install the new ignition coil in the same manner as outlined in the previous step and reconnect the electrical connector.

4. Inspect/Replace Fuel Injector (if necessary)

• Step 1: If the ignition system is functioning correctly, check the fuel injector for cylinder 1.
• Step 2: Remove the fuel rail if necessary to access the injector.
• Step 3: Disconnect the fuel injector connector and remove the injector.
• Step 4: Inspect the injector for clogs or damage. Replace if necessary.
• Step 5: Reinstall the injector, reconnect the fuel rail, and check for leaks.

5. Compression Test (if misfire persists)

• Step 1: Remove the spark plug from cylinder 1.
• Step 2: Insert the compression tester into the spark plug hole.
• Step 3: Crank the engine for a few seconds and record the compression reading.
• Step 4: Compare the reading with the manufacturer's specifications. If low, further investigation into engine internals may be required.