how to fix P0303 code in Honda CR-V Sixth Generation (2023-present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel injector tester.
• Safety Warnings: Disconnect the battery before working on electrical systems, allow the engine to cool before beginning repairs.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Using a socket wrench, remove the spark plug for cylinder 3.
• Inspect the spark plug for wear; replace it if it shows signs of fouling or damage.
• Install a new spark plug and torque it to the manufacturer's specifications (typically around 13 lb-ft).
• Reattach the ignition coil.

3. Inspect and Replace Ignition Coil

• Remove the ignition coil from cylinder 3.
• Test the ignition coil using a multimeter; if it fails the test, replace it with a new unit.
• Reinstall the ignition coil and ensure it is securely connected to the spark plug.

4. Check and Clean Fuel Injector

• Disconnect the fuel injector connector for cylinder 3.
• Use a noid light to check for proper signal to the injector; if no signal, inspect wiring.
• If the injector is faulty, remove it using the appropriate socket and replace it. Clean the injector ports if needed before installation.
• Reconnect the fuel injector and ensure it is seated properly.

5. Perform Compression Test

• If misfire persists, conduct a compression test on cylinder 3.
• Record the compression readings; they should match the specifications in the service manual.
• If readings are low, further diagnosis may be required for potential internal issues (valve problems, piston rings, etc.).