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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety while working on the vehicle.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, anti-seize compound.
• Remove the engine cover if necessary.
• Disconnect the ignition coil connector and remove the ignition coil from cylinder 1.
• Remove the spark plug using a spark plug socket.
• Inspect the old spark plug for signs of wear or fouling.
• Install the new spark plug, applying anti-seize compound on the threads.
• Torque the spark plug to the manufacturer's specification (typically around 13-15 lb-ft).

3. Replace Ignition Coil

• If the spark plug is in good condition, proceed to inspect and replace the ignition coil if necessary.
• Reconnect the ignition coil connector and secure it in place.
• If the ignition coil is faulty, remove the old coil and install the new coil, ensuring it is properly seated.

4. Clean or Replace Fuel Injector

• If the fuel injector is clogged, clean it using a fuel injector cleaning kit or replace it with a new one.
• Disconnect the fuel injector connector and remove it from the rail.
• Install the cleaned or new fuel injector, ensuring a proper seal.
• Reconnect the injector connector.

5. Check for Vacuum Leaks

• Inspect all vacuum lines for cracks or loose connections.
• Use a smoke machine or carburetor cleaner to identify leaks around the intake manifold.
• Repair or replace any damaged hoses or gaskets.

6. Final Reassembly

• Reinstall the engine cover if it was removed.
• Reconnect the negative battery terminal.