how to troubleshoot P0302 code in my Toyota Corolla E210 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool if it has been running.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, dielectric grease.
• Remove the ignition coil for cylinder 2 by unscrewing the retaining bolts.
• Pull the ignition coil out gently.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for wear; replace with a new spark plug if necessary (specifications: NGK ILZKR7B11 or equivalent, gap: 0.043 inches).
• Apply a small amount of dielectric grease to the spark plug threads and reinstall.
• Reinstall the ignition coil and torque it to manufacturer specifications (typically around 7 ft-lbs).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil for damage.
• Tools Required: Socket set, multimeter.
• Use the multimeter to test the resistance of the ignition coil; compare with manufacturer specifications.
• Replace the ignition coil if it is faulty (OEM part recommended).
• Reinstall the ignition coil and reconnect the electrical connector.

4. Check Fuel Injector

• Test the fuel injector for cylinder 2 using a noid light.
• If the injector does not pulse, it may need replacement.
• Tools Required: Noid light, basic hand tools.
• Remove the fuel injector connector and check for continuity.
• Replace the injector if it is faulty (OEM part recommended).

5. Check for Vacuum Leaks

• Visually inspect hoses and intake manifold for cracks or disconnections.
• Use a smoke machine or carb cleaner to identify leaks.
• Repair or replace any damaged hoses or gaskets.

6. Verify Engine Compression

• If misfire persists, perform a compression test on cylinder 2.
• Tools Required: Compression gauge.
• Remove spark plug and insert the compression gauge.
• Crank the engine and take the reading; compare with manufacturer specifications.
• If compression is low, further engine diagnostics may be necessary.