why does my Toyota RAV4 Fifth Generation (2019-present) have a check engine light with code P0302

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression gauge
• Fuel injector tester
• Multimeter

2. Inspect Ignition Components

• Remove Engine Cover: Use a socket set to remove any bolts securing the engine cover.
• Check Spark Plug: Remove the spark plug from cylinder number 2 using a socket wrench. Inspect for wear or damage. If worn, replace it with a new spark plug, ensuring the gap is set to manufacturer's specifications.
• Inspect Ignition Coil: Remove the ignition coil from cylinder number 2. Check for cracks or damage. If defective, replace the ignition coil and torque it to the manufacturer’s specifications (typically around 7-10 ft-lbs).

3. Test Fuel Injector

• Connect Fuel Injector Tester: Attach the fuel injector tester to cylinder number 2's fuel injector connector.
• Activate Injector: Follow the tester's instructions to activate the injector and observe the spray pattern. If the injector is not functioning correctly, replace it.
• Reinstall Components: Reconnect the ignition coil and spark plug after testing.

4. Perform Compression Test

• Remove Spark Plug: Take out the spark plug from cylinder number 2 again.
• Insert Compression Gauge: Screw in the compression gauge into the spark plug hole.
• Crank Engine: Have someone crank the engine while you observe the compression reading. It should be within the manufacturer's specified range (usually between 140-200 psi). If low, further diagnosis is needed for potential internal engine issues.

5. Check for Vacuum Leaks

• Inspect Vacuum Lines: Visually inspect all vacuum lines for cracks or disconnections.
• Spray Test: With the engine running, spray a small amount of carburetor cleaner around the intake manifold and vacuum lines. If the engine speed changes, there is a vacuum leak that needs to be repaired.

6. Reassemble and Reconnect

• Reinstall all components in reverse order of removal.
• Ensure all electrical connections are secure.
• Reconnect the negative battery terminal.