how to fix P0301 code on Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Replace Spark Plug

1. Remove the ignition coil cover (if applicable).
2. Disconnect the electrical connector from the ignition coil.
3. Remove the ignition coil using a socket set.
4. Unscrew and remove the spark plug using a spark plug socket.
5. Install a new spark plug, ensuring the gap is set according to manufacturer specifications (typically around 0.044 inches).
6. Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect/Replace Ignition Coil

1. If the spark plug replacement does not resolve the issue, test the ignition coil with a multimeter for proper resistance.
2. If faulty, remove the ignition coil as previously described.
3. Install a new ignition coil, ensuring it is seated properly.
4. Reconnect the electrical connector.

4. Inspect/Replace Fuel Injector

1. If misfire persists, check the fuel injector for cylinder 1.
2. Remove the injector connector and unscrew the injector from the rail.
3. Clean or replace the injector as necessary.
4. Reinstall the fuel injector and reconnect the connector.

5. Conduct Compression Test

1. If no issues found with spark plug, ignition coil, or fuel injector, perform a compression test.
2. Remove the spark plug from cylinder 1.
3. Insert the compression gauge into the spark plug hole.
4. Crank the engine and note the reading. Compare it to the specifications (usually around 180 psi).
5. If the reading is low, further investigation into valve or piston issues may be necessary.