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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Multimeter
• Compression gauge

2. Inspect and Replace Spark Plug

• Remove the ignition coil cover.
• Disconnect the wiring harness from the ignition coil.
• Remove the ignition coil using a socket wrench.
• Inspect the spark plug for wear or damage; replace if necessary.
• Install a new spark plug to the manufacturer’s torque specification (typically around 13-16 lb-ft).

3. Inspect and Replace Ignition Coil

• If the spark plug is fine, test the ignition coil’s resistance using a multimeter (consult specifications for expected resistance).
• If the coil is faulty, replace it with a new one.
• Reinstall the ignition coil and reconnect the wiring harness.

4. Inspect Fuel Injector

• Disconnect the fuel injector electrical connector.
• Use a multimeter to check injector resistance (typically should be around 12-16 ohms).
• If the injector is faulty, replace it.
• Reconnect the injector and ensure it is secured properly.

5. Compression Test

• 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 180-200 psi).
• If compression is low, further investigation may be needed for internal engine issues.

6. Reassemble and Clear Codes

• Reinstall any components removed during the inspection.
• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0302 code and any other related codes.