how to fix Honda Pilot YF4 (2023-Present) P0301 misfire code

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts during repairs.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if applicable (use socket set).
2. Use a spark plug socket to remove the spark plug from cylinder 1.
3. Inspect the spark plug for signs of wear or damage (check for carbon fouling, cracks).
4. If necessary, replace with a new spark plug (use manufacturer's recommended type and gap).
5. Torque the new spark plug to manufacturer specifications (typically around 13-15 lb-ft).

3. Check and Replace Ignition Coil

1. Disconnect the ignition coil connector from cylinder 1.
2. Remove the ignition coil by unscrewing the retaining bolts (if applicable).
3. Inspect the ignition coil for cracks or damage.
4. If necessary, replace the ignition coil with a new one (ensure it matches OEM specifications).
5. Reconnect the ignition coil and ensure it is securely fastened.

4. Test Fuel Injector

1. Disconnect the fuel injector connector for cylinder 1.
2. Use a noid light to check for signal from the ECU while cranking the engine. If the light does not flash, the injector may be faulty.
3. If needed, replace the fuel injector for cylinder 1 (ensure it is compatible with the Honda Pilot).
4. Reconnect the fuel injector connector.

5. Perform Compression Test (if necessary)

1. Remove the spark plug from cylinder 1.
2. Insert a compression gauge into the spark plug hole.
3. Crank the engine a few times and record the compression reading.
4. Compare the reading to manufacturer specifications. If low, further investigation into mechanical issues may be needed.