why does my Toyota Highlander XU70 (2020-Present) display a P0302 code?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester.
• Gather all necessary tools and parts before starting the repair.
• Disconnect the battery to prevent any electrical issues during the repair.

2. Inspect and Replace Spark Plug

• Remove the spark plug cover (if applicable) using a socket set.
• Using a spark plug socket, remove the spark plug from cylinder 2.
• Inspect the spark plug for wear, carbon deposits, or damage.
• Replace with a new spark plug if necessary, ensuring it is gapped according to manufacturer specifications (typically around 0.043 inches).
• Reinstall the spark plug and torque it to the manufacturer's specifications (usually around 13-15 lb-ft).

3. Check and Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil on cylinder 2.
• Remove the ignition coil by removing the retaining bolts using a socket set.
• Inspect the ignition coil for any signs of damage or corrosion.
• If defective, replace it with a new ignition coil, ensuring it is seated correctly and secured with the retaining bolts (torque to manufacturer specifications).
• Reconnect the electrical connector.

4. Inspect Fuel Injector

• Disconnect the electrical connector from the fuel injector on cylinder 2.
• Remove the fuel rail (if necessary) to access the fuel injector.
• Inspect the fuel injector for clogs or damage.
• If needed, replace the fuel injector with a new one, ensuring proper seating in the manifold.
• Reconnect the electrical connector and any lines removed during the process.

5. Test Compression

• Remove the spark plug from cylinder 2 (if not already done).
• Insert the compression tester into the spark plug hole.
• Crank the engine and read the compression value.
• Compare the reading with manufacturer specifications; if it's low, further diagnosis of the cylinder may be necessary.