how do I diagnose a P0302 code in my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather necessary tools and components.
• Disconnect the vehicle battery to ensure safety during repairs.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 2.
• Use a spark plug socket to remove the spark plug.
• Inspect the old spark plug and replace it with a new one, ensuring it's the correct type for your RAV4.
• Torque the spark plug to the manufacturer’s specifications (typically around 13-15 ft-lbs).
• Reinstall the ignition coil.

3. Test and Replace Ignition Coil (if necessary)

• Tools Required: Multimeter.
• Connect a multimeter to the ignition coil terminals to test for resistance.
• If the readings are outside the manufacturer’s specifications, replace the ignition coil with a new one.
• Reinstall the ignition coil after replacement.

4. Inspect and Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector removal tool, socket set.
• Remove the fuel rail to access the injector for cylinder 2.
• Inspect the injector for clogs or leaks; clean or replace as necessary.
• Reinstall the fuel rail and ensure all connections are secure.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 2.
• Insert the compression tester into the spark plug hole and crank the engine.
• Record the compression reading and compare it to the specifications (typically around 180 psi).
• If the compression is low, investigate potential mechanical issues (e.g., worn rings, faulty valves).