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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, gapping tool.
• Remove the engine cover (if applicable) to access the spark plug.
• Use a socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for signs of wear, carbon buildup, or damage.
• If necessary, replace the spark plug with a new one, ensuring it is gapped according to manufacturer specifications (typically around 0.043 inches for a Corolla).
• Torque the new spark plug to the manufacturer’s specification (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Disconnect the electrical connector from the ignition coil on cylinder 1.
• Remove the mounting bolts securing the ignition coil and lift it out.
• Inspect the coil for cracks or damage; replace if necessary with a new ignition coil.
• Reinstall the ignition coil, securing it with bolts and reconnecting the electrical connector.

4. Check Fuel Injector

• Tools Required: Fuel injector cleaning kit or replacement injector.
• Disconnect the fuel rail and remove the injector for cylinder 1.
• Inspect the injector for clogs or leaks.
• Clean the injector using a cleaning kit or replace it if it is faulty.
• Reinstall the injector and reconnect the fuel rail securely.

5. Compression Test (if needed)

• Tools Required: Compression tester.
• Remove the spark plug for cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine.
• Compare the compression reading with manufacturer specifications (typically around 180 psi).
• If compression is low, further engine diagnostics may be required.