how to fix P0303 misfire code on Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Step 1: Remove the ignition coil from cylinder 3 by unscrewing the mounting bolt and disconnecting the electrical connector.
• Step 2: Remove the spark plug using a spark plug socket and ratchet. Inspect the old spark plug for wear or deposits.
• Step 3: Install a new spark plug with the correct gap (typically around 0.043 inches for a Honda CR-V).
• Step 4: Reinstall the ignition coil ensuring it is seated properly and reconnect the electrical connector.

3. Test/Replace Ignition Coil

• Step 1: If the spark plug replacement does not resolve the issue, remove the ignition coil for cylinder 3.
• Step 2: Test the ignition coil with a multimeter to ensure it operates within specifications (typically around 0.5 to 1.5 ohms for primary resistance).
• Step 3: If faulty, replace the ignition coil with a new one.
• Step 4: Reinstall the ignition coil and reconnect all connections.

4. Inspect/Replace Fuel Injector

• Step 1: Check the fuel injector for cylinder 3 using a noid light to ensure it is receiving the proper signal.
• Step 2: If non-functional, remove the fuel rail and replace the fuel injector for cylinder 3.
• Step 3: Reassemble the fuel rail, ensuring all seals are secure, and reconnect any electrical connectors.

5. Final Steps

• Reconnect the negative battery terminal.
• Start the engine and monitor for any unusual noises or symptoms.