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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery.
• Allow the engine to cool down.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the ignition coil from cylinder 2.
  • Unplug the electrical connector.
  • Remove the mounting bolts and lift the coil out.
• Remove the spark plug from cylinder 2.
  • Use a spark plug socket to unscrew the spark plug.
• Install the new spark plug.
  • Apply anti-seize compound on the threads (if recommended).
  • Torque to manufacturer specifications (typically around 13-15 lb-ft).
• Reinstall the ignition coil.

3. Check/Replace Ignition Coil

• Tools Required: Multimeter
• Test the ignition coil for cylinder 2:
  • Measure the primary and secondary resistance using the multimeter.
  • Compare readings with specifications from the service manual.
• If faulty, replace the ignition coil with a new one.
• Reinstall the ignition coil after testing or replacement.

4. Inspect/Replace Fuel Injector

• Tools Required: Fuel injector removal tool, cleaning solvent
• Disconnect the fuel line and electrical connector from the injector in cylinder 2.
• Remove the fuel injector using the removal tool.
• Clean the injector or replace it with a new one if clogged or malfunctioning.
• Reinstall the injector and reconnect the fuel line and electrical connector.

5. Compression Test (if necessary)

• Tools Required: Compression tester
• Remove spark plugs and connect the compression tester to cylinder 2.
• Crank the engine and record the compression reading.
• Compare with specifications; if low, further diagnosis may be needed (valve or head gasket issues).