how to fix P0301 misfire code on Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery cable to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if necessary.
• Locate the spark plug for cylinder 1 (usually at the front of the engine).
• Use the spark plug socket to remove the old spark plug.
• Inspect the spark plug socket for carbon buildup and clean if necessary.
• Install the new spark plug and tighten to the manufacturer’s specified torque (typically around 13 lb-ft for Toyota).
• Reinstall the engine cover.

3. Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Remove the ignition coil for cylinder 1 by unscrewing the retaining bolts.
• Disconnect the electrical connector from the ignition coil.
• Install the new ignition coil and reconnect the electrical connector.
• Tighten the ignition coil bolts to the manufacturer’s specified torque (usually around 7 lb-ft).

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, fuel line disconnect tool.
• Disconnect the fuel line from the injector.
• Remove the fuel injector from cylinder 1.
• Clean the injector using fuel injector cleaner or replace it if faulty.
• Reinstall the injector, ensuring it is seated correctly, and reconnect the fuel line.

5. Perform Compression Test (if necessary)

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and note the compression reading (should be within specs, typically 180-200 psi).
• If the compression is low, further investigation into the engine may be required.