how to diagnose a P0302 code on my Toyota Camry XV50 (2012-2017)?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, compression tester, multimeter, torque wrench, spark plug socket, vacuum gauge.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Replace Spark Plug

1. Remove the engine cover (if applicable) by unscrewing bolts or clips.
2. Locate the spark plug for cylinder 2.
3. Use a spark plug socket to remove the old spark plug from cylinder 2.
4. Inspect the removed spark plug for signs of wear or fouling.
5. Install a new spark plug of the manufacturer-recommended type.
6. Torque the new spark plug to the specified value (usually around 13-16 lb-ft).
7. Reattach the engine cover if removed.

3. Check and Replace Ignition Coil

1. Disconnect the electrical connector from the ignition coil for cylinder 2.
2. Remove the retaining bolt and carefully pull the ignition coil out.
3. Inspect the coil for cracks or burn marks; replace if necessary.
4. Install the new ignition coil and secure it with the retaining bolt.
5. Reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

1. Remove the fuel rail by unscrewing the mounting bolts.
2. Carefully disconnect the fuel injector for cylinder 2 from the fuel rail.
3. Inspect the injector for clogs; clean it using a fuel injector cleaner if needed.
4. Reinstall the injector and reattach the fuel rail, ensuring all connections are secure.

5. Perform Compression Test (if necessary)

1. Remove the spark plug from cylinder 2 again.
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 result with the manufacturer's specifications; if low, further investigation is needed.