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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector from cylinder 2.
• Remove the ignition coil by unscrewing the bolts and lifting it out.
• Use a spark plug socket to remove the old spark plug from cylinder 2.
• Inspect the spark plug for damage (e.g., burnt or cracked insulator) and replace it with a new one, ensuring proper gap according to specifications (typically 0.044 inches for Honda).
• Torque the new spark plug to the manufacturer's specification (approximately 13 lb-ft).
• Reinstall the ignition coil and connect the wiring harness.

3. Replace Ignition Coil (if necessary)

• If the ignition coil tested faulty, replace it with a new part.
• Remove the old coil as per the steps above.
• Install the new ignition coil and reconnect the electrical connector.
• Ensure all connections are secure.

4. Check and Clean Fuel Injector

• If the injector is found faulty, remove the fuel rail to access the injector.
• Replace the injector if necessary, ensuring to use a new o-ring for a proper seal.
• Clean the injector using an ultrasonic cleaner or replacement if heavily clogged.

5. Reassemble and Reconnect

• Reinstall any components removed for access during the repair.
• Reconnect the negative battery terminal.
• Start the engine to ensure proper operation.