how to fix P0302 code in Toyota Corolla E140 (2006-2013)

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, fuel injector cleaner, and basic hand tools.
• Ensure the vehicle is parked on a level surface, and the engine is cool.

2. Inspect and Replace Spark Plug

1. Disconnect the negative battery terminal.
2. Remove the engine cover if applicable.
3. Remove the ignition coil for cylinder 2:
   • Disconnect the electrical connector.
   • Unbolt the coil using the appropriate socket.
4. Remove the spark plug from cylinder 2 using a spark plug socket.
5. Inspect the spark plug for wear, carbon buildup, or damage.
6. Replace with a new spark plug (use OEM specifications).
7. Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil

1. If the spark plug is fine, test the ignition coil:
   • Use a multimeter to check the resistance of the coil (refer to the service manual for specifications).
2. If the resistance is out of spec, replace the ignition coil with a new one.
3. Reinstall the ignition coil after replacing it.

4. Inspect and Clean Fuel Injector

1. If the ignition system is functioning correctly, check the fuel injector:
   • Remove the fuel injector connector.
   • Use a multimeter to test if the injector is receiving power.
2. If it is not receiving power, trace wiring for faults.
3. If it is receiving power, remove the fuel injector and clean it using a fuel injector cleaner.
4. Reinstall the injector and reattach the connector.

5. Perform Compression Test

1. If misfire persists, perform a compression test on cylinder 2.
2. Remove the spark plug, insert the compression tester, and crank the engine.
3. Compare the compression reading with specifications from the service manual.
4. If compression is low, further investigation into piston rings, valves, or head gasket may be necessary.