how to fix a check engine light with code P0302 in Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench, dielectric grease.
• Remove the ignition coil from cylinder 2:
  1. Disconnect the electrical connector from the ignition coil.
  2. Remove the mounting bolts and lift the coil out.
• Remove the spark plug:
  1. Use the spark plug socket to unscrew the spark plug from cylinder 2.
  2. Inspect the spark plug for signs of wear or damage; replace if necessary.
• Install the new spark plug:
  1. Apply a small amount of dielectric grease to the spark plug threads.
  2. Torque the spark plug to the manufacturer’s specification (typically around 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, check the ignition coil:
  1. Visually inspect the coil for cracks or signs of wear.
  2. Use a multimeter to test the resistance of the coil; replace if out of specifications.
• Install the new ignition coil:
  1. Position the coil over the spark plug and secure it with the mounting bolts.
  2. Reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, basic hand tools.
• Remove the fuel injector from cylinder 2:
  1. Disconnect the electrical connector from the fuel injector.
  2. Release the fuel line and remove the mounting bolts.
• Clean the injector using a fuel injector cleaner or replace it if clogged.
• Reinstall the fuel injector, ensuring it is securely fastened and connected.

5. Conduct a Compression Test

• Tools Required: Compression tester.
• Remove the ignition coil and spark plug for cylinder 2.
• Insert the compression tester into the spark plug hole and crank the engine:
  1. Note the reading and compare it to specifications (typically around 180-200 psi).
• If compression is low, it may indicate mechanical issues (e.g., valve problems, piston rings).

6. Final Steps

• Reconnect the negative battery terminal.
• Clear the error codes using the OBD-II scanner.
• Start the engine and monitor for any abnormal noises or warning lights.