how to resolve Honda Pilot YF3 (2016-2022) check engine code P0301?

Solution

1. Preparation

• Gather all necessary tools and parts. Disconnect the battery before starting any electrical work.
• Tools Required: Socket set, torque wrench, spark plug socket, multimeter, compression tester, noid light.

2. Replace Spark Plug

1. Remove the engine cover if necessary.
2. Disconnect the ignition coil connector for cylinder 1.
3. Unscrew the ignition coil bolts and remove the coil.
4. Using the spark plug socket, carefully unscrew and remove the old spark plug.
5. Inspect the new spark plug and set the gap according to manufacturer specifications (typically around 0.043 inches for Honda).
6. Install the new spark plug by hand to avoid cross-threading, then torque to manufacturer's specifications (typically around 13 lb-ft).
7. Reinstall the ignition coil and secure it with bolts. Reconnect the ignition coil connector.

3. Test Ignition Coil

1. Use a multimeter to test the primary and secondary resistance of the ignition coil according to specifications.
2. If out of spec, replace the ignition coil with a new unit.

4. Inspect and Clean Fuel Injector

1. Remove the fuel rail and the fuel injector for cylinder 1.
2. Clean the injector with a proper cleaning solution or replace it if it’s clogged.
3. Reinstall the fuel injector, ensuring it is seated properly.

5. Perform Compression Test

1. Remove the spark plug from cylinder 1.
2. Insert the compression tester into the spark plug hole and crank the engine for several seconds.
3. Check the compression reading and compare it with manufacturer specifications (typically around 190-210 psi).
4. If compression is low, further investigation into piston rings or valves may be necessary.