how to fix P0303 code in Honda Accord 8th Generation (2008-2012)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before beginning work.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if applicable.
2. Disconnect the ignition coil connector from the spark plug of cylinder 3.
3. Remove the ignition coil using a socket set (usually 10mm).
4. Remove the spark plug using a spark plug socket.
5. Inspect the spark plug for wear or damage. Replace if necessary (use OEM specifications for type and gap).
6. Install the new spark plug and torque it to manufacturer specifications (typically around 13 ft-lbs).
7. Reinstall the ignition coil and reconnect the connector.

3. Check and Replace Ignition Coil

1. If the spark plug is in good condition, test the ignition coil for proper resistance with a multimeter.
2. If the ignition coil is faulty, replace it with a new unit.
3. Follow the same steps to reinstall the ignition coil as done in the spark plug replacement.

4. Inspect Fuel Injector

1. Disconnect the fuel injector connector for cylinder 3.
2. Use a multimeter to check for proper voltage and resistance at the injector.
3. If the injector is faulty, replace it with a new one.
4. Reconnect the fuel injector and ensure all connections are secure.

5. Compression Test

1. Remove the spark plug from cylinder 3.
2. Insert a compression gauge into the spark plug hole.
3. Crank the engine for a few seconds and record the compression reading.
4. Compare the reading to the manufacturer’s specifications (usually around 180-200 psi).
5. If the compression is low, further investigation into engine internals may be required.