how to fix P0302 misfire code in a Toyota RAV4 XA40 (2013-2018)

Solution

1. Preparation

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

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector for cylinder 2.
• Remove the ignition coil and set it aside.
• Use the spark plug socket to remove the spark plug from cylinder 2.
• Inspect the spark plug for wear; replace it if necessary.
• Install the new spark plug, torquing it to the manufacturer's specification (usually around 13 lb-ft).
• Reinstall the ignition coil and reconnect the connector.

3. Inspect/Replace Ignition Coil

• Tools Required: Socket set
• If the ignition coil was found to be faulty, remove it as described in the previous step.
• Install a new ignition coil for cylinder 2, ensuring it is seated properly.
• Reconnect the ignition coil connector.

4. Check Fuel Injector

• Tools Required: Noid light, multimeter
• Disconnect the fuel injector connector for cylinder 2.
• Use a noid light to check for signal; if no light, inspect the wiring and ECM.
• If the injector is faulty, remove it and replace it with a new one, ensuring proper seating and connection.

5. Conduct Compression Test

• Tools Required: Compression tester
• Remove the spark plug from cylinder 2 and install the compression tester.
• Crank the engine and record the compression reading. It should be within the manufacturer's specifications (usually around 180-200 psi).
• If compression is low, further investigation into valves or piston rings may be required.