how to fix the P0301 misfire code on my Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather tools and parts: OBD-II scanner, socket set, multimeter, compression tester, replacement spark plug, and ignition coil (if needed).
• Ensure the vehicle is parked on a level surface, engine is cool, and the battery is disconnected before starting work.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the ignition coil cover if applicable.
  2. Disconnect the ignition coil connector.
  3. Remove the ignition coil from cylinder 1.
  4. Unscrew and remove the spark plug using a spark plug socket.
  5. Inspect the spark plug for wear; replace if necessary with OEM specifications.
  6. Install the new spark plug and torque it to manufacturer specifications (typically around 13 lb-ft).
  7. Reinstall the ignition coil and connector.

3. Test and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. Using a multimeter, check the ignition coil resistance:
     • Primary resistance: 0.4 - 2.0 ohms
     • Secondary resistance: 6,000 - 15,000 ohms
  2. If out of range, replace the ignition coil with an OEM part.
  3. Reconnect the ignition coil connector.

4. Inspect and Clean Fuel Injector

• Sub-steps:
  1. Use a fuel injector cleaning kit to clean the injector for cylinder 1, following the manufacturer's instructions.
  2. If cleaning does not resolve the issue, replace the fuel injector with a new one as per OEM specifications.

5. Conduct Compression Test (if misfire persists)

• Sub-steps:
  1. Remove the ignition coil and spark plug from cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine for a few seconds and record the compression reading.
  4. Compare the result with manufacturer specifications (typically around 180-200 psi).
  5. If compression is low, further investigation into engine internals may be required.