why does my Toyota Corolla E170 (2013-2019) have a check engine light and code P0302

Solution

1. Preparation

• Gather tools and ensure the vehicle is parked on a flat surface with the engine off.
• Disconnect the battery to avoid any electrical issues during the repair.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector and remove the ignition coil from cylinder 2.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear or damage; replace if necessary.
• Install a new spark plug, tightening to manufacturer specifications (typically 13-16 lb-ft).
• Reinstall the ignition coil and reconnect the connector.

3. Check and Replace Ignition Coil (if necessary)

• If the spark plug is fine, test the ignition coil with a multimeter for proper resistance.
• If the coil is faulty, replace it with a new ignition coil specific to the Corolla E170.
• Reinstall the ignition coil as per the previous steps.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner kit (if cleaning), basic hand tools.
• Disconnect the fuel rail and remove the fuel injector for cylinder 2.
• Inspect and clean the injector; replace if it is clogged or malfunctioning.
• Reinstall the fuel injector and reconnect the fuel rail.

5. Compression Test (if misfire persists)

• Tools Required: Compression tester.
• Remove the spark plug for cylinder 2 and insert the compression tester.
• Crank the engine and record the compression reading.
• Compare the reading with manufacturer specifications; replace the cylinder head gasket or repair internal engine components if necessary.