how to fix P0302 code in Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Locate cylinder 2 spark plug; typically, this will be labeled or easily identifiable.
• Use the spark plug socket to remove the old spark plug.
• Inspect the old spark plug for signs of fouling or damage.
• Install the new spark plug, ensuring it is the correct type for your Honda Civic (typically NGK or Denso).
• Torque the spark plug to manufacturer specifications (usually around 13-15 lb-ft).

3. Inspect and/or Replace Ignition Coil

• Tools Required: Socket set, multimeter (if testing).
• Disconnect the electrical connector from the ignition coil for cylinder 2.
• Remove the ignition coil from the engine by unscrewing any bolts.
• If testing, check the coil’s resistance with a multimeter; compare results to specifications.
• If faulty, install a new ignition coil and reconnect the electrical connector.

4. Check and/or Replace Fuel Injector

• Tools Required: Noid light or multimeter, fuel line tool (if necessary).
• Disconnect the electrical connector from the fuel injector for cylinder 2.
• Use a noid light to check for signal; if no signal, further diagnose the wiring and ECM.
• If necessary, remove the fuel rail and replace the injector for cylinder 2.
• Reinstall any components removed after the injector replacement.

5. Reassemble and Reconnect

• Reattach any components removed during the process (engine cover, connectors).
• Reconnect the negative battery terminal.