my Honda Civic 10th Generation (2016-2021) has a check engine light with error code P0301, what does...

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on the electrical components.
• Allow the engine to cool before starting any work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts.
• Pull the ignition coil out carefully to avoid damaging it.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear (e.g., carbon deposits, electrode wear). Replace if necessary with a new spark plug (OEM specifications).
• Reinstall the new spark plug and torque it to the manufacturer's specified value (typically around 13-16 lb-ft).

3. Test and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil using a multimeter.
• If the resistance values are outside the manufacturer's specifications, replace the ignition coil for cylinder 1.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect Fuel Injector

• Disconnect the fuel injector electrical connector.
• Use a multimeter to check the injector's resistance; replace if out of specification.
• Clean the fuel injector or replace it if it is clogged or malfunctioning.

5. Check Engine Compression

• If misfire persists, conduct a compression test on cylinder 1.
• If compression is low, investigate potential internal engine issues (e.g., valve problems, piston rings).

6. Reassemble and Test

• Reassemble any components that were removed during inspection.
• Reconnect the battery and start the engine.
• Monitor for any check engine light reoccurrence or symptoms.