how to fix P0302 misfire code in a Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2:
  • Unplug the electrical connector from the ignition coil.
  • Remove the retaining bolt using a socket set.
• Remove the spark plug:
  • Use a spark plug socket to unscrew the old spark plug.
  • Inspect the spark plug for wear (carbon buildup, oil fouling).
• Install a new spark plug:
  • Ensure the gap is set to the manufacturer's specification (typically around 0.043 inches).
  • Install the new spark plug and torque it to the specified value (usually around 13-16 ft-lbs).
• Reinstall the ignition coil over the new spark plug and secure it.

3. Inspect and Replace Ignition Coil

• If the ignition coil appears damaged, replace it:
  • Remove the ignition coil as previously described.
  • Install a new ignition coil for cylinder 2.
  • Secure it with the retaining bolt and reconnect the electrical connector.

4. Check and Clean Fuel Injector

• If fuel injector malfunction is suspected:
  • Remove the fuel rail to access the injector.
  • Disconnect the fuel injector connector and remove it from the rail.
• Clean the injector with a suitable fuel injector cleaner or replace it if it is clogged or damaged.
• Reinstall the fuel injector and fuel rail, ensuring proper seating and connection.

5. Compression Test (if necessary)

• If previous steps do not resolve the issue, perform a compression test:
  • Remove all spark plugs to facilitate testing.
  • Insert a compression gauge into the cylinder 2 spark plug hole.
  • Crank the engine and record the compression reading.
• Compare to specifications (usually around 180 psi) and address any low compression issues accordingly.