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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Replace Spark Plug in Cylinder 2

1. Remove the ignition coil by unscrewing the bolts and disconnecting the electrical connector.
2. Use a spark plug socket and ratchet to remove the spark plug from cylinder 2.
3. Inspect the old spark plug for wear and replace it with a new one, ensuring the gap is set to the manufacturer’s specification (typically around 0.043 inches for Toyota).
4. Reinstall the ignition coil and reconnect the electrical connector.

3. Test Ignition Coil

1. Remove the ignition coil from cylinder 2.
2. Use a multimeter to measure the resistance of the ignition coil. Compare values to specifications from the service manual.
3. If the coil is faulty, replace it with a new ignition coil and reinstall it.

4. Inspect and Clean Fuel Injector

1. Remove the fuel rail to access the injector for cylinder 2.
2. Disconnect the fuel injector electrical connector and fuel line (use caution as fuel may spray).
3. Remove the fuel injector from the rail.
4. Clean the injector using a professional-grade injector cleaner or replace it with a new injector if necessary.
5. Reinstall the injector, fuel rail, and reconnect all components.

5. Check for Vacuum Leaks

1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
2. Use a smoke machine or carburetor cleaner to check for leaks around the intake manifold.
3. Repair or replace any leaking hoses or gaskets.