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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the negative battery terminal for safety.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Locate the spark plug for cylinder 1 (usually near the front of the engine).
• Use a socket wrench to remove the spark plug.
• Inspect the spark plug for wear (burnt, cracked, or fouled).
• Install a new spark plug (specification: NGK or Denso, gap according to manufacturer specs).
• Torque the spark plug to the manufacturer’s specification (typically around 13 lb-ft).

3. Inspect and Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil in cylinder 1.
• Remove the ignition coil by unscrewing it from the engine.
• Inspect the coil for cracks or signs of overheating.
• If defective, replace with a new ignition coil (OEM recommended).
• Reinstall the ignition coil and reconnect the electrical connector.

4. Test and Clean Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Use a multimeter to test the injector's resistance (should match manufacturer’s specs).
• If the injector is faulty, replace it with an OEM part.
• Clean the fuel injector using a fuel injector cleaner kit if it’s functioning but dirty.

5. Perform Compression Test (if necessary)

• Remove the spark plug for cylinder 1 and insert compression tester.
• Crank the engine and record the compression reading.
• Compare with the manufacturer’s specifications (typically 180-210 psi).
• If low, further investigation into the engine's internal components may be needed.