how to fix P0303 misfire code in Honda Accord Eleventh Generation (2023-present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and set the parking brake.
• Disconnect the battery to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Remove the engine cover if necessary.
• Use a socket set to remove the spark plug from cylinder three.
• Inspect the spark plug for signs of wear or carbon buildup.
• If damaged, replace with a new spark plug (specification: NGK, Denso, or OEM equivalent).
• Torque the new spark plug to the manufacturer’s specification (usually around 13-16 lb-ft).

3. Check and Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil using a socket set.
• Visually inspect the coil for cracks or damage.
• If faulty, replace it with a new ignition coil (OEM recommended).
• Reinstall the ignition coil and reconnect the electrical connector.

4. Fuel Injector Inspection

• Disconnect the fuel injector connector and remove it using a socket set.
• Inspect for leaks or damage and ensure proper fit.
• If necessary, replace the fuel injector with an OEM part.
• Reinstall the fuel injector and reconnect the electrical connector.

5. Compression Test (if needed)

• Remove the spark plug from cylinder three and install the compression gauge.
• Crank the engine and note the compression reading.
• Compare the reading to manufacturer specifications; if low, further engine diagnostics may be required.