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

Solution

1. Preparation

• Disconnect the negative battery terminal to prevent electrical shorts.
• Gather necessary tools and parts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the ignition coil from cylinder 1 by unscrewing the mounting bolts and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket and ratchet. Inspect for wear or damage.
• If necessary, replace the spark plug with a new one that meets the manufacturer’s specifications (typically NGK or Denso with a gap of 0.044 inches).
• Reinstall the spark plug and torque it to the manufacturer's specification (approximately 13 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set
• If the spark plug is in good condition, proceed to check the ignition coil.
• Remove the ignition coil from cylinder 1, inspecting for any cracks or damage.
• Replace the ignition coil if defective with a compatible part.
• Reinstall the ignition coil and ensure it’s properly seated.

4. Test Fuel Injector

• Tools Required: Fuel injector cleaner or multimeter
• If the ignition coil and spark plug are functioning correctly, test the fuel injector for cylinder 1.
• Use a multimeter to check for resistance; compare it with manufacturer specifications (typically around 12-16 ohms).
• Clean or replace the fuel injector if faulty. Install a new injector if necessary.

5. Perform a Compression Test

• Tools Required: Compression gauge
• If misfire persists, perform a compression test on cylinder 1.
• Remove the spark plug and insert the compression gauge. Crank the engine to obtain a reading.
• Compare the compression reading with manufacturer specifications (around 180 psi).
• If the reading is low, further inspection of the engine internals may be necessary.