how to fix P0302 code on Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather tools and equipment.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 2:
  1. Disconnect the electrical connector from the ignition coil.
  2. Unscrew the coil using the ratchet and socket.
• Remove the spark plug:
  1. Use the spark plug socket to remove the spark plug from cylinder 2.
• Inspect the spark plug for wear or damage.
• Replace with a new spark plug if necessary:
  1. Torque the new spark plug to the manufacturer-recommended specification (typically 13 lb-ft or 18 Nm).

3. Inspect and Replace Ignition Coil

• Tools Required: Ratchet, socket set.
• If the spark plug is fine, check the ignition coil:
  1. Using a multimeter, check the resistance of the ignition coil. Compare the readings to specifications in the service manual.
  2. If the coil is faulty, replace it with a new one.
  3. Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect and Test Fuel Injector

• Tools Required: Noid light or multimeter.
• Remove the fuel injector connector from cylinder 2:
  1. Check for voltage using a noid light or multimeter.
  2. If no voltage is present, trace back to the engine control unit (ECU) and check wiring.
• If the injector is faulty:
  1. Remove the fuel rail to access the injector.
  2. Replace the faulty injector with a new one.
  3. Reinstall the fuel rail and reconnect all connectors.

5. Verify Compression

• Tools Required: Compression tester.
• Perform a compression test on cylinder 2:
  1. If the compression is low, further diagnostics may be needed (valve issues, head gasket failure).