how to fix P0304 code in Honda CR-V Sixth Generation (2023-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery negative terminal to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Multimeter
• Fuel injector cleaning kit (if needed)

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 4 by unscrewing the bolts and disconnecting the electrical connector.
• Remove the spark plug from cylinder 4 using a spark plug socket.
• Inspect the spark plug and replace it if damaged or worn.
• Torque the new spark plug to the manufacturer's specification (typically around 13-15 lb-ft).

3. Test and Replace Ignition Coil

• Reconnect the ignition coil to the electrical connector and use a multimeter to test for proper voltage.
• If the coil fails the test, remove it and replace it with a new coil.
• Reinstall the ignition coil and secure it with bolts.

4. Compression Test

• Remove the spark plug from cylinder 4 and insert the compression tester.
• Crank the engine several times and record the compression reading.
• Compare the reading with the manufacturer specifications to determine if there is an internal engine issue. If low, consider further diagnostics or repairs.

5. Check and Clean Fuel Injector

• Remove the fuel injector from cylinder 4.
• Use a fuel injector cleaning kit to clean the injector or replace it if necessary.
• Reinstall the cleaned or new fuel injector and ensure it is securely connected.