how to resolve P0301 code on Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester
• Disconnect the negative battery terminal to prevent electrical shock.
• Allow the engine to cool before starting work.

2. Inspect and Replace Ignition Components

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the ignition coil connector on cylinder 1.
  3. Remove the ignition coil by unscrewing the retaining bolts.
  4. Inspect the spark plug for wear; replace if necessary (ensure the gap is set to manufacturer's specifications).
  5. Replace the ignition coil with a new one if it's faulty.
  6. Reconnect the ignition coil connector and reattach the engine cover.

3. Check Fuel Injector Function

• Sub-steps:
  1. Remove the fuel injector connector on cylinder 1.
  2. Use a multimeter to check the injector's resistance; replace the injector if the resistance is out of specifications.
  3. Reconnect the injector connector after inspection or replacement.

4. Perform 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 with specifications; if low, further engine repairs may be needed.

5. Reassemble and Clear Codes

• Sub-steps:
  1. Reinstall the spark plug and ignition coil.
  2. Reconnect the negative battery terminal.
  3. Use the OBD-II scanner to clear the P0301 code.