how to fix P0300 code in Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plugs

• Remove the ignition coil cover using a socket set.
• Unscrew and remove the spark plugs using a spark plug socket.
• Inspect the spark plugs for wear and carbon buildup.
• If damaged or worn, replace with OEM spark plugs (specification: Denso SK16HR11 or equivalent).
• Torque the new spark plugs to 13 lb-ft (17.6 Nm).

3. Check and Test Ignition Coils

• Remove the ignition coils from the spark plug holes.
• Use a multimeter to test the primary and secondary resistance of each ignition coil (Primary: 0.4 - 2.0 ohms; Secondary: 6,000 - 15,000 ohms).
• If any coil is out of specification, replace it with an OEM coil.
• Reinstall the ignition coils and secure them properly.

4. Inspect Fuel Injectors

• Remove the fuel rail cover.
• Disconnect the fuel injector connectors.
• Use a fuel pressure gauge to check for proper fuel pressure (should be around 43-50 psi).
• If pressure is low, inspect the fuel pump and filter.
• Clean or replace any clogged fuel injectors if necessary.

5. Check for Vacuum Leaks

• With the engine running, spray a small amount of carb cleaner around the intake manifold and vacuum hoses.
• Listen for any changes in engine RPM, indicating a vacuum leak.
• Replace any damaged hoses or gaskets.

6. Test MAF and TPS Sensors

• Disconnect the MAF sensor and TPS sensor connectors.
• Use a multimeter to test voltage and resistance according to the manufacturer’s specifications.
• Replace any faulty sensors with OEM components.