how to fix P0301 misfire code in Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, fuel pressure gauge, compression tester.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shock.

2. Inspect Ignition Components

• Sub-steps:
  1. Remove the engine cover if necessary.
  2. Disconnect the ignition coil connector for cylinder 1.
  3. Remove the ignition coil using a socket set.
  4. Inspect the spark plug for wear or damage; replace if necessary.
  5. If the spark plug is damaged, replace it with a new one, ensuring it's gapped to manufacturer specifications.

3. Check Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Use a multimeter to test the injector's resistance; compare the reading to specifications.
  3. If the injector is faulty, replace it with a new one.
  4. Reconnect the fuel injector and ensure the connector is secure.

4. Compression Test

• Sub-steps:
  1. Remove the 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 reading to the manufacturer's specifications; if low, further diagnostics may be needed on the engine.

5. Reassemble and Test

• Sub-steps:
  1. Reinstall the spark plug and ignition coil.
  2. Reconnect the battery.
  3. Start the engine and allow it to idle.
  4. Check for any DTCs using the OBD-II scanner after warming up the engine.