why does my Honda Civic have a check engine light with code P0302

Solution

1. Preparation

• Gather necessary tools and materials.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting the work.

2. Inspect and Replace Spark Plug

• Remove the spark plug wire or ignition coil from cylinder 2.
• Use a spark plug socket to remove the spark plug from cylinder 2.
• Inspect the spark plug for wear or damage; replace if necessary.
• Install a new spark plug, ensuring it is gapped correctly (typically 0.044 inches for Honda Civic).
• Reattach the ignition coil or spark plug wire.

3. Check and Replace Ignition Coil

• Remove the ignition coil from cylinder 2 (if applicable).
• Inspect the coil for any physical damage or cracks.
• If a replacement is necessary, install a new ignition coil, ensuring proper seating and connection.
• Torque the coil to the manufacturer's specifications (usually around 7-10 Nm).

4. Fuel Injector Inspection

• Disconnect the electrical connector from the fuel injector for cylinder 2.
• Use a noid light to check for proper signal to the injector.
• If the injector is faulty, remove it using a fuel injector puller.
• Install a new fuel injector, ensuring proper sealing and connection.

5. Compression Test

• Perform a compression test on cylinder 2 using a compression gauge.
• If compression is low (below manufacturer specifications), further inspection is needed for valve or piston issues.