how to fix P0302 misfire code on my Honda Civic 9th Generation (2012-2015)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench
• Remove the engine cover if necessary.
• Locate and remove the spark plug for cylinder 2 using the spark plug socket.
• Inspect the spark plug for signs of wear (e.g., carbon build-up, electrode damage).
• If worn, replace with a new spark plug, ensuring it is gapped correctly (check manufacturer specs).
• Torque the spark plug to the manufacturer's specification (usually around 13-17 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench
• Locate the ignition coil for cylinder 2.
• Disconnect the electrical connector from the ignition coil.
• Remove the mounting bolts and pull the ignition coil out.
• Inspect for cracks or damage; if damaged, replace with a new ignition coil.
• Install the new ignition coil, secure it with bolts, and reconnect the electrical connector.
• Torque the bolts to the manufacturer’s specification (usually around 7-10 lb-ft).

4. Inspect and Clean or Replace Fuel Injector

• Tools Required: Fuel injector removal tool (if required), O-ring lubricant
• Locate the fuel injector for cylinder 2.
• Disconnect the fuel injector electrical connector.
• Remove any retaining clips and pull out the fuel injector.
• Inspect the injector for clogs; clean it with an injector cleaner or replace if necessary.
• If replacing, lubricate the O-rings with clean engine oil and install the new injector.
• Reconnect the electrical connector and secure with clips.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0302 code from the system.