how to fix P0301 code in Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, fuel injector cleaner.
• Ensure the vehicle is parked on a level surface, and the engine is cool before beginning work.

2. Replace Spark Plug

• Sub-steps:
  1. Disconnect the negative battery terminal to avoid electrical shorts.
  2. Remove the engine cover (if applicable) using the socket set.
  3. Locate the spark plug for cylinder 1 and remove the ignition coil by unscrewing it.
  4. Use a spark plug socket to remove the old spark plug.
  5. Inspect the spark plug for signs of wear or damage. Replace it with a new spark plug, ensuring it is gapped correctly.
  6. Reinstall the ignition coil and secure it properly.

3. Test and Replace Ignition Coil

• Sub-steps:
  1. Using a multimeter, check the resistance of the ignition coil. Compare it to specifications in the service manual.
  2. If the coil is faulty, disconnect the wiring harness and remove it from the engine.
  3. Install the new ignition coil and reconnect the wiring harness.

4. Inspect and Clean Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector and fuel line (ensure to relieve fuel pressure first).
  2. Remove the fuel injector from the cylinder head.
  3. Clean the injector using fuel injector cleaner or replace it if it is clogged or malfunctioning.
  4. Reinstall the fuel injector, ensuring it is seated properly.

5. Verify Compression

• Sub-steps:
  1. Remove the spark plug for cylinder 1 and insert the compression tester.
  2. Crank the engine for a few seconds and note the compression reading.
  3. Compare the reading to the manufacturer’s specifications. If compression is low, further engine diagnosis may be required.