how to fix a misfire code P0302 in my Toyota Corolla E140 (2006-2013)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery cable to ensure safety.
• Allow the engine to cool down if it has been running.

2. Replace Spark Plug

• Remove the spark plug cover if applicable.
• Use a spark plug socket and ratchet to remove the spark plug from cylinder 2.
• Inspect the spark plug; if it appears fouled or damaged, replace it with a new one.
• Torque the new spark plug to the manufacturer's specifications (typically around 13 lb-ft).
• Reinstall the spark plug cover.

3. Check and Replace Ignition Coil

• Disconnect the wiring harness from the ignition coil in cylinder 2.
• Remove the ignition coil using the appropriate socket.
• Test the ignition coil with a multimeter (refer to the vehicle service manual for the specific resistance values).
• If the coil is faulty, replace it with a new one and ensure it is properly seated.
• Reconnect the wiring harness.

4. Inspect and Clean Fuel Injector

• Locate the fuel injector for cylinder 2 and disconnect the electrical connector.
• Remove the fuel injector using the proper socket and technique (ensure you have a fuel line wrench if necessary).
• Inspect the injector for clogs and clean it using a fuel injector cleaner or replace it if necessary.
• Reinstall the injector and reconnect the electrical connector.

5. Perform Compression Test

• 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 the manufacturer's specifications; if low, further inspection of the engine might be necessary.