how to fix P0301 misfire code in Honda Accord 9th Generation (2013-2017)

Solution

1. Preparation

• Gather tools: socket set, OBD-II scanner, compression tester, multimeter, torque wrench.
• Ensure the vehicle is parked on a level surface, and the engine is off and cool.

2. Replace Spark Plug

• Remove Engine Cover: Use a socket set to remove any necessary bolts securing the engine cover.
• Disconnect Ignition Coil: Unplug the electrical connector from the ignition coil on cylinder 1.
• Remove Ignition Coil: Unscrew the bolts securing the ignition coil and carefully pull it out.
• Replace Spark Plug: Use a spark plug socket to remove the old spark plug. Inspect the new spark plug for proper gap (0.043 inches for Honda Accord) and install it.
• Reinstall Ignition Coil: Place the ignition coil back in position, secure it with bolts, and reconnect the electrical connector.
• Reinstall Engine Cover: Secure the engine cover back into place.

3. Replace Ignition Coil (if necessary)

• If the ignition coil was found faulty, procure a new ignition coil for cylinder 1.
• Follow the same steps as above to remove and replace the ignition coil.

4. Compression Test

• Remove Spark Plug: If not already done, remove the spark plug from cylinder 1.
• Insert Compression Tester: Screw in the compression tester into the spark plug hole.
• Crank Engine: Have an assistant crank the engine for a few seconds while observing the compression gauge. Record the reading.
• Evaluate Results: If the compression is below specifications (around 180 psi), further engine diagnosis may be required.

5. Check Fuel Injector (if necessary)

• Use a multimeter to test the resistance of the fuel injector for cylinder 1. It should typically be around 12-16 ohms.
• If the injector is faulty, replace it by removing the fuel rail and installing a new injector.