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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.
• Allow the engine to cool if it has been running.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 3.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for wear or fouling; replace if necessary.
• Install the new spark plug and torque it to the manufacturer's specifications (typically around 13-16 lb-ft).
• Reinstall the ignition coil.

3. Test and Replace Ignition Coil (if necessary)

• Tools Required: OBD-II scanner, multimeter.
• Using the multimeter, test the resistance of the ignition coil.
• If the ignition coil fails the test, remove it and replace it with a new one.
• Reconnect the wiring harness and ensure a secure fit.

4. Clean or Replace Fuel Injector

• Tools Required: Fuel injector cleaner, fuel injector removal tool.
• If the fuel injector is dirty, use a fuel injector cleaner and run it through the fuel system.
• If it’s damaged, remove the fuel rail and replace the injector for cylinder 3.
• Reassemble the fuel rail and reconnect all lines securely.

5. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 3 and install the compression tester.
• Crank the engine and take the reading. Compare it against the manufacturer’s specifications.
• If compression is low, further investigation into the engine internals may be necessary.