how to fix Honda Civic 9th Generation (2012-2015) engine light and P0302 code

Solution

1. Preparation

• Gather necessary tools and parts before beginning repairs.
• Disconnect the negative terminal of the battery to avoid electrical shock.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Remove the engine cover (if applicable) using a socket set.
• Use a spark plug socket to remove the spark plug from cylinder 2.
• Inspect the spark plug for wear; if damaged, replace it with a new one (check specifications for the correct type and gap).
• Install the new spark plug and torque to manufacturer specifications (typically around 13 lb-ft for Honda).

3. Inspect and Replace Ignition Coil

• Locate the ignition coil for cylinder 2 (usually accessed by removing the engine cover).
• Remove the electrical connector from the ignition coil.
• Unscrew the ignition coil and remove it from the cylinder head.
• Replace with a new ignition coil if it shows signs of damage or malfunction.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Check and Clean Fuel Injector

• Locate the fuel injector for cylinder 2 (may require removing the intake manifold).
• Disconnect the fuel line and electrical connector from the injector.
• Remove the fuel injector and inspect for clogs or damage.
• Clean the injector with a specialized fuel injector cleaner or replace it if necessary.
• Reinstall the injector, ensuring proper seating and connection.

5. Compression Test (if required)

• Remove the spark plug from cylinder 2.
• Insert a compression gauge into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading to manufacturer specifications (typically around 180 psi for a healthy engine).
• If compression is low, further investigation is needed for potential internal engine issues.