how to fix the P0302 code on my Toyota Corolla E140 (2006-2013)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety while working.

2. Inspect and Replace Spark Plug

• Remove the engine cover (if applicable) using a socket set.
• Disconnect the ignition coil connector and unbolt the ignition coil from cylinder 2.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear or damage; replace if necessary with a new spark plug (OEM recommended).
• Reinstall the spark plug and torque to manufacturer specifications (usually 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

• If the spark plug is fine, check the ignition coil for signs of damage or wear.
• Install a new ignition coil if needed (OEM recommended).
• Reconnect the ignition coil and ensure it is bolted down properly.

4. Check and Clean Fuel Injector

• Remove the fuel rail if necessary to access the fuel injector for cylinder 2.
• Disconnect the fuel injector connector and remove the injector from the rail.
• Inspect the injector for clogs or leaks; clean it using a fuel injector cleaner if it appears dirty.
• Reinstall the fuel injector and reconnect the connector carefully.

5. Conduct Compression Test

• Remove spark plugs from all cylinders for accurate testing.
• Insert the compression tester into the cylinder 2 spark plug hole and crank the engine.
• Compare the compression reading to specifications (typically around 180 psi for most engines). If low, further diagnosis on internal engine components may be needed.

6. Inspect for Vacuum Leaks

• With the engine running, use a smoke machine or spray carburetor cleaner around the intake manifold and vacuum hoses to check for leaks.
• Repair any identified leaks by replacing gaskets or hoses as necessary.