how to troubleshoot P0302 code on Toyota Corolla E140 (2006-2013)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before beginning work.

2. Inspect and Replace Spark Plug

• Remove the spark plug from cylinder 2 using a socket wrench.
• Inspect the spark plug for wear, carbon deposits, or damage. Replace if necessary.
• Install a new spark plug, ensuring it is gapped correctly according to manufacturer specifications (typically around 0.044 inches for a Corolla).
• Torque the spark plug to the manufacturer’s specified value (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coil

• Remove the ignition coil from cylinder 2 by unbolting it (if applicable) and disconnecting the electrical connector.
• Test the ignition coil with a multimeter for resistance; replace if it is out of specification.
• Install a new ignition coil, ensuring it is seated properly and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Disconnect the fuel injector connector for cylinder 2.
• Remove the fuel injector from its rail, being cautious of fuel spillage.
• Clean the fuel injector using a specialized fuel injector cleaner or replace it if it is clogged or damaged.
• Reinstall the injector, ensuring it is seated correctly and reconnect the electrical connector.

5. Perform Compression Test

• If misfire persists, perform a compression test on cylinder 2.
• Insert the compression gauge into the spark plug hole and crank the engine to get a reading.
• Compare the compression values to the manufacturer’s specifications (typically around 180 psi for a healthy engine). If the compression is low, further diagnosis is needed for potential issues like valve problems or head gasket failure.