how to fix the P0302 code on my Honda Civic 10th Generation (2016-2021)?

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, gap gauge.
• Remove the ignition coil from cylinder 2 by unscrewing the retaining bolts and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for signs of wear (burnt, cracked, or fouled) and replace it if necessary.
• Ensure the new spark plug is gapped to manufacturer specifications (typically around 0.044 inches for Honda).
• Reinstall the spark plug and torque it to the specified value (usually around 13 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Fuel Injector

• Tools Required: Fuel injector removal tool (if applicable), O-rings (if replacing).
• Disconnect the fuel injector connector and fuel line (use caution and have a rag ready to catch any fuel).
• Remove the fuel injector from cylinder 2 by unfastening any retaining clips or bolts.
• Inspect the injector for blockages or leaks. If defective, replace it with a new one.
• Ensure to replace the O-rings to prevent leaks.
• Reattach the fuel line and connector.

4. Compression Test (if necessary)

• Tools Required: Compression tester.
• Remove the spark plug for cylinder 2 and connect the compression tester.
• Crank the engine to take the compression reading. Compare it to the manufacturer’s specifications (usually around 180 psi).
• If compression is low, further investigation is required (valve issues, piston rings, etc.).

5. Clear Codes and Reconnect Battery

• After repairs, reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0302 code and any other stored codes.