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

Solution

1. Preparation

• Gather tools and materials.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Ignition Components

1. Remove the engine cover if applicable.
2. Remove the ignition coil:
   • Disconnect the electrical connector.
   • Unbolt the ignition coil using a socket set.
   • Pull out the ignition coil from the spark plug well.
3. Inspect the spark plug:
   • Remove the spark plug using a spark plug socket.
   • Check for signs of fouling, wear, or damage.
   • Replace with a new spark plug if necessary (use OEM specifications for gap).
4. Install the new ignition coil:
   • Place the new ignition coil into the cylinder.
   • Bolt it down and reconnect the electrical connector.

3. Check Fuel Injector

1. Remove the fuel injector:
   • If the injector is not firing, disconnect the fuel rail.
   • Carefully unclip and remove the fuel injector from the rail.
2. Test the injector:
   • Use a multimeter to check for resistance; compare with specifications.
   • Clean the injector if it appears dirty or replace it if faulty.
3. Reinstall the fuel injector:
   • Attach the injector back into the fuel rail and reconnect the fuel line.

4. Check for Vacuum Leaks

1. Inspect all vacuum hoses connected to the intake manifold and replace any that are cracked or damaged.
2. Spray a small amount of brake cleaner around the intake manifold while the engine is running to detect any changes in RPM indicating a leak.

5. Final Assembly

• Reconnect the battery terminal.
• Reinstall any components that were removed (e.g., engine cover).