how to fix P0303 code in Honda Accord 9th Generation (2013-2017)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative terminal of the battery to ensure safety.
• Allow the engine to cool before beginning work.

2. Replace Spark Plug

1. Remove the ignition coil cover by unscrewing any retaining bolts.
2. Disconnect the electrical connector from the ignition coil for cylinder 3.
3. Remove the ignition coil by unscrewing it from the cylinder head.
4. Unscrew the spark plug from cylinder 3 using a spark plug socket.
5. Inspect the old spark plug for wear and replace it with a new OEM spark plug, torquing it to the manufacturer’s specification (typically around 13 lb-ft).
6. Reinstall the ignition coil and reattach the electrical connector.

3. Replace Ignition Coil (if necessary)

1. If the ignition coil was faulty, install a new ignition coil on cylinder 3.
2. Ensure that the coil is properly seated and reconnect the electrical connector.

4. Check/Replace Fuel Injector (if necessary)

1. If fuel injector issues are suspected, remove the fuel rail assembly carefully.
2. Remove the injector for cylinder 3, inspecting it for clogs or damage.
3. Replace the injector with a new OEM injector if needed.
4. Reinstall the fuel rail and ensure all connections are secure.

5. Clear Codes and Test

1. Reconnect the negative battery terminal.
2. Use the OBD-II scanner to clear the P0303 code.
3. Start the engine and let it warm up.
4. Test drive the vehicle to ensure that the misfire has been resolved.