how to fix P0301 misfire code in my Honda Pilot YF3 (2016-2022)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool and disconnect the negative battery terminal.

2. Replace Spark Plug

1. Remove the engine cover if applicable.
2. Use a socket set to remove the spark plug wire or ignition coil from cylinder 1.
3. Use a spark plug socket to remove the old spark plug.
4. Inspect the new spark plug for proper gap (typically 0.043 inches for Honda).
5. Install the new spark plug hand-tight, then torque to 13 lb-ft.
6. Reattach the ignition coil or spark plug wire.

3. Test Ignition Coil

1. If the misfire persists, remove the ignition coil from cylinder 1.
2. Inspect the ignition coil for cracks or damage.
3. Swap the ignition coil with one from a different cylinder.
4. Clear the codes and test drive the vehicle to see if the P0301 code returns.

4. Inspect and Clean Fuel Injector

1. If the misfire persists, remove the fuel injector from cylinder 1 using an appropriate socket.
2. Inspect the fuel injector for clogs or damage.
3. Clean the injector using a fuel injector cleaner or replace it if necessary.
4. Reinstall the injector, ensuring it is seated properly.

5. Compression Test

1. If all prior steps do not resolve the issue, perform a compression test on cylinder 1.
2. Remove the spark plug and install the compression tester.
3. Crank the engine until the gauge stabilizes.
4. Record the compression reading and compare it to specifications (usually around 180 psi).
5. If compression is low, further diagnostics on engine internals may be required.