how to fix P0304 misfire code in Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Multimeter

2. Replace Spark Plug

• Remove the engine cover if applicable using a socket set.
• Locate the spark plug for cylinder 4 (refer to the vehicle's manual for location).
• Use a spark plug socket to remove the old spark plug.
• Inspect the old spark plug for excessive wear or carbon buildup.
• Install a new spark plug, ensuring it is gapped correctly according to manufacturer specifications (typically 0.043 inches).
• Torque the spark plug to the manufacturer's specification (usually around 13 lb-ft).

3. Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil for cylinder 4.
• Remove the ignition coil by unbolting it with the socket set.
• Install a new ignition coil, ensuring it is seated properly and bolt it down securely.
• Reconnect the electrical connector.

4. Test and Replace Fuel Injector (if necessary)

• Use a multimeter to check the resistance of the fuel injector for cylinder 4; compare it to manufacturer specifications.
• If the injector is faulty, remove the fuel rail and carefully extract the fuel injector from cylinder 4.
• Install the new fuel injector and reassemble the fuel rail.

5. Verify Compression (if necessary)

• Insert the compression tester into the spark plug hole of cylinder 4.
• Crank the engine and read the compression value; compare it to manufacturer specifications (typically between 190-220 psi).
• If compression is low, further investigation into valve timing or head gasket issues may be required.