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

Solution

1. Preparation

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

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector.
• Remove the ignition coil from cylinder 3.
• Use a spark plug socket to remove the old spark plug from cylinder 3.
• Inspect the new spark plug and set the gap according to manufacturer specifications.
• Install the new spark plug and torque it to the manufacturer’s specified value (typically around 13 lb-ft).
• Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil with a multimeter for primary and secondary resistance.
• If out of spec, replace the ignition coil.
• Tools Required: Socket set, multimeter.
• Remove the ignition coil.
• Install the new ignition coil and reconnect the connector.

4. Check Fuel Injector

• If misfire persists, remove and inspect the fuel injector for cylinder 3.
• Tools Required: Fuel injector puller, socket set.
• Clean the fuel injector or replace it if faulty.
• Reinstall the fuel injector ensuring proper seating and connection.

5. Compression Test

• If the issue remains unresolved, perform a compression test on cylinder 3.
• Tools Required: Compression tester.
• Remove the spark plug from cylinder 3.
• Insert the compression tester and crank the engine.
• Compare results with manufacturer specifications; if low, further engine diagnostics are required.