how to address P0303 code on my Honda Accord 8th Generation (2008-2012)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent any electrical shorts.
• Ensure the engine is cool before starting work.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, dielectric grease.
• Remove the engine cover if applicable.
• Disconnect the electrical connector from the ignition coil on cylinder 3.
• Remove the bolt securing the ignition coil using a socket.
• Gently pull out the ignition coil from the cylinder head.
• Inspect and replace the spark plug in cylinder 3:
  • Remove the spark plug using a spark plug socket.
  • Check the gap on the new spark plug to ensure it meets manufacturer specifications.
  • Apply dielectric grease to the inside of the ignition coil boot.
  • Install the new spark plug and torque it to the manufacturer’s specifications (usually around 13-15 lb-ft).
• Reinstall the ignition coil and secure it with the bolt. Reconnect the electrical connector.

3. Test Fuel Injector

• Tools Required: Noid light or fuel injector tester.
• Disconnect the electrical connector from the fuel injector on cylinder 3.
• Connect the noid light to the fuel injector connector and crank the engine to check for a flashing light, indicating the injector is receiving a signal.
• If no signal, trace wiring back to the engine control unit (ECU) and check for continuity.
• If the signal is present but the injector is not functioning, replace the fuel injector.

4. Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 3.
• Insert the compression gauge into the spark plug hole.
• Crank the engine for several seconds and record the compression reading.
• Compare the reading to specifications (usually around 180-200 psi). If low, further diagnostics may be needed for valve or piston issues.