how to fix the P0301 misfire code in my Toyota Corolla E170 (2013-2019)?

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Remove the engine cover if applicable.
• Tools Required: Socket set
• Remove the spark plug wire or ignition coil.
• Use a spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for damage, wear, or fouling. Replace if necessary.
• Install a new spark plug with the correct gap as specified by the manufacturer.
• Reattach the ignition coil or spark plug wire.

3. Test or Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil using a multimeter to check for resistance.
• Tools Required: Multimeter
• If the coil is faulty, remove it and replace it with a new ignition coil.
• Reattach the electrical connector and ensure it is secure.

4. Test Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Use a noid light or multimeter to check for power and signal to the injector.
• If the injector is not receiving power, trace the wiring back to the engine control unit (ECU).
• If the injector is faulty, replace it with a new fuel injector.
• Reconnect the fuel injector connector.

5. Compression Test

• If the above components are in good condition and the misfire persists, perform a compression test on cylinder 1.
• Tools Required: Compression tester
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine.
• Compare the reading with manufacturer specifications. If the compression is low, further investigation is required for potential internal engine issues.