how to diagnose P0302 code in my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover if necessary.
• Locate and remove the spark plug for cylinder 2 using a spark plug socket.
• Inspect the spark plug for signs of wear or damage (e.g., carbon buildup, excessive gap).
• If damaged, replace with a new spark plug that meets manufacturer specifications (typically NGK or Denso).
• Torque the new spark plug to the manufacturer's specifications (usually around 13 ft-lbs).

3. Check and Replace Ignition Coil

• Tools Required: Socket set
• Remove the ignition coil from cylinder 2 by unscrewing the retaining bolts.
• Inspect the coil for cracks or damage.
• If necessary, replace the ignition coil with a new one that meets OEM specifications.
• Reinstall the coil and ensure it is seated properly.

4. Inspect Fuel Injector

• Tools Required: Fuel injector cleaning kit, multimeter (if testing electrical connection)
• Disconnect the electrical connector from the fuel injector for cylinder 2.
• Use a multimeter to check for proper voltage and resistance.
• If the injector is faulty, replace it with a new one.
• Consider cleaning the injector using a cleaning kit if it appears clogged.

5. Perform Compression Test

• Tools Required: Compression tester
• Remove the spark plug from cylinder 2.
• Insert the compression tester into the spark plug hole.
• Crank the engine several times to get a reading.
• Compare the compression reading to the manufacturer’s specifications. If low, further investigation into piston rings or valves may be needed.