what should I do if my Honda Civic 9th Generation (2012-2015) has a P0302 code

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, noid light.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plug

1. Remove the ignition coil from cylinder 2.
2. Unscrew and remove the spark plug using a spark plug socket.
3. Inspect the spark plug for signs of wear or fouling; replace if necessary.
   • Replacement part: Quality spark plug recommended by the manufacturer.
4. Install the new spark plug, ensuring it is torqued to the manufacturer’s specifications (typically around 13-16 lb-ft).
5. Reinstall the ignition coil, ensuring it is seated correctly.

3. Check and Replace Ignition Coil

1. If the spark plug is in good condition, test the ignition coil for proper function using a multimeter.
   • Primary resistance should be within manufacturer specifications (usually around 0.5 - 1.5 ohms).
2. If the ignition coil is faulty, remove it and replace with a new one.
   • Replacement part: OEM ignition coil for cylinder 2.
3. Reconnect all electrical connectors securely.

4. Inspect Fuel Injector

1. Check the operation of the fuel injector for cylinder 2 using a noid light.
2. If the injector is not functioning, remove the fuel injector harness and the injector itself.
3. Clean the injector or replace it with a new one if necessary.
   • Replacement part: OEM fuel injector for cylinder 2.
4. Reinstall the injector, ensuring it is seated properly in the intake manifold.

5. Verify Compression

1. If misfire persists, perform a compression test on cylinder 2.
2. If compression is below specifications (typically 180-200 psi), further investigation into engine internals may be required.