how to address the check engine light with code P0302 on my Toyota RAV4?

Solution

1. Preparation

• Gather the necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is on a flat surface and securely elevated if needed.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if applicable.
2. Locate the spark plug for cylinder 2 (refer to the service manual for exact location).
3. Use a spark plug socket to remove the spark plug.
4. Inspect the spark plug for wear or damage (e.g., carbon buildup, electrode wear).
5. If the spark plug is faulty, replace it with a new one, ensuring it is gapped to the manufacturer specifications.
6. Reinstall the spark plug and torque it to the specified value (typically around 13-16 lb-ft for most Toyota models).

3. Inspect and Replace Ignition Coil

1. Disconnect the electrical connector from the ignition coil on cylinder 2.
2. Remove the ignition coil mounting bolts using a socket set.
3. Carefully remove the ignition coil from the cylinder head.
4. Inspect the coil for cracks or damage; if faulty, replace with a new coil.
5. Reinstall the new ignition coil, tightening the bolts to the manufacturer’s specifications.
6. Reconnect the electrical connector to the ignition coil.

4. Inspect and Clean Fuel Injector

1. Remove the fuel injector harness connector from cylinder 2.
2. Use the appropriate tools to remove the fuel rail if necessary to access the injector.
3. Inspect the fuel injector for clogs or leaks; clean it using a fuel injector cleaner or replace if needed.
4. Reinstall the fuel injector and ensure it is seated properly in the rail.
5. Reconnect the fuel rail and electrical connectors.

5. Verify Compression

1. Remove the spark plug for cylinder 2.
2. Insert a compression gauge into the spark plug hole.
3. Crank the engine for a few seconds and record the compression reading.
4. Compare the reading to the manufacturer’s specifications; if the compression is low, further investigation is required.