how to fix P0302 misfire code on Toyota Corolla E210 (2019-2024)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to prevent electrical issues during repairs.

2. Inspect and Replace Ignition Components

1. Remove the engine cover (if applicable) using a socket set.
2. Disconnect the ignition coil from the electrical connector.
3. Remove the ignition coil using a socket or wrench.
4. Inspect the spark plug condition; replace if worn or fouled.
5. Install a new spark plug with the correct gap (typically 0.043 inches for this model).
6. Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Fuel Injector

1. Locate the fuel injector for cylinder 2.
2. Disconnect the fuel injector connector.
3. Remove the fuel injector using a fuel injector puller if necessary.
4. Install a new fuel injector and ensure it seats properly.
5. Reconnect the fuel injector connector.

4. Perform a Compression Test

1. Remove the spark plug from cylinder 2.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine for a few seconds and record the compression reading.
4. Compare the reading with manufacturer specifications (usually around 170 psi for the Corolla). If low, investigate further.

5. Check for Vacuum Leaks

1. Inspect vacuum hoses connected to the intake manifold for cracks or disconnections.
2. Use a smoke machine or carburetor cleaner to identify leaks around the intake manifold.
3. Repair any leaks found by replacing hoses or resealing the intake manifold.