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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface with the engine cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug gap tool.
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts and disconnecting the electrical connector.
• Remove the old spark plug using a spark plug socket.
• Check the gap on the new spark plug and adjust to the manufacturer's specification (typically around 0.028-0.031 inches).
• Install the new spark plug by hand, then torque to the specified value (usually around 13 ft-lbs).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil

• If the ignition coil was found defective during diagnostics, follow these steps:
• Tools Required: Socket set, torque wrench.
• Remove the ignition coil from cylinder 1 as previously described.
• Install the new ignition coil and torque it to the specified value (usually around 7 ft-lbs).
• Reconnect the electrical connector.

4. Inspect/Replace Fuel Injector

• If the fuel injector is faulty:
• Tools Required: Fuel injector removal tool, socket set.
• Relieve fuel pressure from the fuel system by removing the fuel pump fuse and running the engine until it stalls.
• Disconnect the fuel lines and electrical connector from the injector.
• Remove the fuel injector from the rail.
• Install the new injector and reverse the disassembly steps to reconnect everything securely.

5. Address Compression Issues

• If compression test results are low:
• Consider performing a leak-down test to diagnose the issue.
• Possible solutions may include valve adjustments, head gasket replacement, or piston ring replacement.