what should I do if my Toyota Highlander has a P0302 code

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2 using a socket set.
• Extract the spark plug from cylinder 2 using a spark plug socket.
• Inspect the spark plug for signs of wear, such as carbon buildup or damage.
• If necessary, replace the spark plug with a new one (specification: NGK Laser Iridium or equivalent).
• Reinstall the spark plug and secure it to the specified torque (typically 13-15 ft-lbs).

3. Check and Replace Ignition Coil

• Test the ignition coil for cylinder 2 using a multimeter to ensure it is functioning correctly (specification: primary resistance 0.4 to 0.6 ohms).
• If the ignition coil is faulty, remove it and replace it with a new unit.
• Reinstall the ignition coil and ensure all connections are secure.

4. Inspect Fuel Injector

• Disconnect the fuel injector connector for cylinder 2.
• Perform a resistance test on the injector (specification: typically around 12-16 ohms).
• If the injector is faulty, remove it and replace it with a new fuel injector.
• Reconnect the injector and ensure it is seated properly.

5. Perform Compression Test

• If misfire persists, conduct a compression test on cylinder 2.
• Record the compression reading; it should be within the manufacturer’s specifications (typically 150-200 psi).
• If compression is low, further investigation may be needed into engine internals.