how to fix P0302 code in Toyota Highlander Third Generation (2014-2019)

Solution

1. Preparation

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

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench, gap gauge.
• Remove the engine cover if necessary.
• Locate the spark plug for Cylinder 2 (refer to the vehicle’s service manual for location).
• Use a spark plug socket to carefully remove the spark plug.
• Inspect the old spark plug for wear and gap; replace if needed.
• Install the new spark plug, ensuring the gap is set to specifications (typically 0.043 inches).
• Torque the spark plug to the manufacturer’s specifications (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, ratchet.
• Disconnect the ignition coil connector for Cylinder 2.
• Remove the bolt securing the ignition coil and lift it out.
• Inspect the coil for cracks or damage; replace if necessary.
• Install the new ignition coil, securing it with the bolt, and reconnect the electrical connector.

4. Test Fuel Injector

• Tools Required: Fuel pressure gauge, injector tester (if needed).
• Disconnect the fuel injector connector for Cylinder 2.
• Use a fuel pressure gauge to check fuel pressure; ensure it meets specifications.
• If pressure is adequate, use an injector tester to ensure the injector is firing correctly.
• Replace the fuel injector if it is not functioning properly.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug for Cylinder 2.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare with specifications (usually around 140-200 psi); replace or repair the engine if compression is low.