how to fix P0302 misfire code in Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, ratchet, extension, dielectric grease.
• Remove the engine cover if necessary.
• Remove the bolt securing the ignition coil in place and disconnect the electrical connector.
• Pull out the ignition coil.
• Remove the spark plug using a spark plug socket.
• Inspect the old spark plug for wear; if it’s damaged, replace it with a new one.
• Apply a small amount of dielectric grease to the inside of the ignition coil boot.
• Install the new spark plug to the manufacturer's torque specification (typically 13-15 ft-lbs).
• Reinstall the ignition coil, ensuring it is seated correctly, and reconnect the electrical connector.

3. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, safety glasses, gloves.
• Remove the intake manifold cover if necessary.
• Disconnect the fuel injector connector for cylinder 2.
• Remove the fuel rail bolts and carefully pull the fuel rail away from the injector.
• Extract the injector from the rail; inspect for clogs or damage.
• Clean the injector using a fuel injector cleaner or replace it if necessary.
• Reinstall the fuel injector and ensure it is secured into the rail before reassembling.

4. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug for cylinder 2 and insert the compression tester.
• Crank the engine and note the compression reading; compare with manufacturer specifications (typically 150-200 psi).
• If the compression is low, further diagnosis is needed to check for valve issues or head gasket failure.