how to fix P0302 misfire code in my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool if it has been running.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 2:
  • Unplug the electrical connector.
  • Remove the mounting bolts (typically 10mm).
  • Carefully pull the coil out.
• Remove the spark plug:
  • Use a spark plug socket to unscrew and remove the old spark plug.
• Install the new spark plug:
  • Ensure the gap is set to manufacturer specifications (usually around 0.043 inches).
  • Tighten the spark plug to manufacturer recommended torque (usually 13 ft-lbs).

3. Inspect and Replace Ignition Coil

• Inspect the ignition coil for any signs of cracks or damage.
• If the coil is faulty, install a new ignition coil:
  • Place the new ignition coil in position and press down firmly.
  • Reinstall the mounting bolts and tighten to manufacturer specifications.
  • Reconnect the electrical connector.

4. Check Fuel Injector

• Remove the fuel injector connector for cylinder 2.
• Use a noid light to check for injector pulse:
  • Connect the noid light to the injector connector; it should flash when the engine is cranked.
• If the injector is not functioning, replace it:
  • Remove the fuel rail if necessary.
  • Replace the faulty injector with a new one and reassemble.

5. Reassemble and Test

• Reconnect the negative battery terminal.
• Start the engine and check for misfire codes again.
• Monitor engine performance and ensure the check engine light is off.