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

Solution

1. Preparation

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

Tools Required:

• OBD-II scanner
• Multimeter
• Compression tester
• Noid light
• Socket set
• Torque wrench

2. Inspect and Replace Spark Plug

1. Remove the ignition coil from cylinder 1:
   • Disconnect the electrical connector.
   • Remove the retaining bolt and lift the coil out.
2. Remove the spark plug:
   • Use a spark plug socket to unscrew the spark plug.
   • Inspect for wear, carbon build-up, or damage; replace if necessary.
3. Install a new spark plug:
   • Gap the new spark plug to manufacturer specifications.
   • Torque to the specified value (usually around 13-16 lb-ft).

3. Test and Replace Ignition Coil if Necessary

1. Check the ignition coil resistance:
   • Set multimeter to ohms and measure the primary and secondary resistance.
   • Compare readings to manufacturer specifications.
2. If readings are out of spec, replace the ignition coil with a new one.
3. Reinstall the ignition coil onto cylinder 1.

4. Inspect and Test Fuel Injector

1. Disconnect the fuel injector connector for cylinder 1.
2. Connect a noid light to the fuel injector connector to check for signal.
3. If the noid light does not flash, the injector may be faulty or misfiring.
4. Replace the fuel injector if necessary, following similar steps for removal and installation as done with the spark plug.

5. Perform Compression Test

1. Remove the spark plug for cylinder 1.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine and record the compression reading.
4. If the compression is low, check the engine for internal damage or leaks.