how to diagnose a P0302 code on my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Replace Spark Plug

• Remove the ignition coil for cylinder 2.
  • Tools: Socket set, ratchet.
• Remove the old spark plug using a spark plug socket.
  • Inspect the old spark plug for wear.
• Install a new spark plug, ensuring it is gapped correctly as per manufacturer specifications (typically around 0.044 inches).
• Reattach the ignition coil.

3. Replace Ignition Coil (if necessary)

• If the inspection of the ignition coil showed signs of damage, remove the faulty ignition coil.
  • Tools: Socket set, ratchet.
• Install a new ignition coil, ensuring it is seated properly and the connector is secure.

4. Test Fuel Injector

• Disconnect the fuel injector connector for cylinder 2.
• Use a multimeter to check for proper resistance according to specifications (usually 12-16 ohms).
• If the injector is faulty, remove it using appropriate tools and install a new fuel injector.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0302 code and any other related codes.