how to fix the check engine light P0300 on my Toyota Camry Seventh Generation (2012-2017)

Solution

1. Preparation

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

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the engine cover (if applicable) using a socket set.
• Disconnect the ignition coils from the wiring harness.
• Remove the ignition coils from the spark plugs.
• Inspect spark plugs for wear or fouling; replace if necessary (Torque to manufacturer specifications).
• Apply dielectric grease to the terminals of the new ignition coils and reconnect them.

3. Check Fuel System

• Tools Required: Fuel pressure gauge, multimeter.
• Attach the fuel pressure gauge to the fuel rail Schrader valve.
• Turn the ignition on (do not start) and check the pressure reading; it should be within manufacturer specifications.
• If the pressure is low, check the fuel pump, fuel filter, and fuel injectors for blockages or malfunctions.
• If necessary, clean or replace the fuel injectors.

4. Inspect Vacuum Lines and Intake System

• Tools Required: Vacuum gauge, basic hand tools.
• Inspect all vacuum lines for cracks or disconnections; replace any damaged lines.
• Check the intake manifold gasket for leaks; replace if necessary.
• Use a vacuum gauge to test for proper vacuum levels.