how to fix P0301 code on my Honda Civic 11th Generation (2022-Present)

Solution

1. Preparation

• Gather tools and parts required.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Inspect and Replace Spark Plug

1. Remove the ignition coil cover if applicable.
2. Disconnect the electrical connector from the ignition coil on cylinder 1.
3. Remove the ignition coil using a socket set.
4. Extract the spark plug from cylinder 1 using a spark plug socket.
5. Inspect the spark plug for wear, carbon buildup, or damage.
6. Replace the spark plug with a new one, ensuring it is gapped correctly (consult specifications).
7. Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil

1. If the spark plug is in good condition, test the ignition coil using a multimeter to check resistance.
2. If the coil is faulty, replace it with a new ignition coil for cylinder 1.
3. Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect Fuel Injector

1. Remove the fuel rail if necessary to access the injector for cylinder 1.
2. Inspect the fuel injector for clogs or leaks.
3. If the injector is faulty, replace it with a new one.
4. Reinstall the fuel rail and ensure all connections are secure.

5. Compression Test

1. Remove the spark plug from cylinder 1.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine to obtain a compression reading.
4. Compare the reading to the manufacturer’s specifications. If low, further investigation is needed for internal engine issues.

6. Reconnect Battery and Clear Codes

1. Reconnect the negative battery terminal.
2. Use the OBD-II scanner to clear any error codes stored in the ECU.