what does it mean if my Toyota Highlander has a code P0302

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for signs of wear or fouling. If damaged, replace it with a new spark plug, ensuring it meets OEM specifications (usually NGK or Denso for Toyota).
• Torque the new spark plug to the manufacturer's specification (typically around 13-15 lb-ft).

3. Test and Replace Ignition Coil

• Reconnect the ignition coil to the electrical connector and test its resistance with a multimeter.
  • If the resistance is outside of the manufacturer's specified range (usually around 0.5-1.0 ohms), replace the ignition coil.
• If replacing, ensure the new coil is properly seated and connected.

4. Inspect Fuel Injector

• Remove the fuel injector from cylinder 2.
• Check for clogs and ensure it is clean; use an ultrasonic cleaner if necessary.
• If the injector is faulty, replace it with a new one and reconnect it securely.

5. Verify Compression

• Perform a compression test on cylinder 2 using a compression gauge.
• If compression is below specifications (usually 130-170 psi for most Toyota engines), further inspection is required for potential internal engine issues.
• If necessary, proceed to repair any internal engine problems before reassembly.