how to fix P0303 code on Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, spark plug socket, and safety glasses.
• Disconnect the battery to ensure safety while working on electrical components.

2. Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector for cylinder 3.
  3. Remove the ignition coil assembly from cylinder 3.
  4. Use a spark plug socket to remove the old spark plug from cylinder 3.
  5. Inspect the new spark plug for proper gap (usually around 0.044 inches).
  6. Install the new spark plug, torqueing it to the manufacturer's specification (typically around 13 lb-ft).
  7. Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

• Sub-steps:
  1. If the ignition coil was found faulty during inspection, remove it from cylinder 3.
  2. Install the new ignition coil, ensuring it is securely seated.
  3. Reconnect the ignition coil connector.

4. Check Fuel Injector

• Sub-steps:
  1. If the fuel injector is suspected to be faulty, disconnect the electrical connector and fuel line (use caution with fuel).
  2. Remove the fuel injector from the fuel rail.
  3. Install a new fuel injector, ensuring proper seating and sealing.
  4. Reconnect the fuel line and electrical connector.

5. Perform Compression Test

• Sub-steps:
  1. Remove the spark plug for cylinder 3.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine and record the compression reading.
  4. If the compression is low, further investigation may be needed for internal engine issues.