how to fix P0302 code in my Toyota Corolla E170 (2013-2019) engine?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal.
• Allow the engine to cool down.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 2 by unscrewing the mounting bolt.
• Pull out the spark plug using a spark plug socket.
• Inspect the spark plug for fouling, wear, or damage.
• If necessary, replace with a new spark plug, torque it to the manufacturer's specifications (usually around 13-16 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coil

• Tools Required: Multimeter.
• Disconnect the ignition coil connector.
• Using a multimeter, check the primary and secondary resistance of the ignition coil. Refer to the vehicle service manual for specific values.
• If the coil is faulty, replace it with a new one.
• Reconnect the ignition coil and its connector.

4. Check and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit or noid light.
• Disconnect the fuel injector connector and check for voltage using a multimeter.
• If voltage is present and the injector is not functioning, replace the fuel injector.
• If cleaning is needed, use a fuel injector cleaning kit to flush the injector.

5. Perform Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 2.
• Insert the compression gauge into the spark plug hole and crank the engine.
• Record the compression reading and compare it to specifications (usually around 140-200 psi).
• If compression is low, investigate further for potential engine issues (e.g., valve problems, head gasket failure).