how to fix P0300 misfire code on Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.

2. Inspect and Replace Spark Plugs

• Tools Required: Socket set, torque wrench.
• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Using the socket set, unscrew and remove the spark plugs.
  3. Inspect each spark plug for signs of wear or damage; replace if necessary.
  4. Gap the new spark plugs according to manufacturer specifications.
  5. Install new spark plugs and torque them to the recommended specification (typically 13-15 ft-lbs).

3. Check and Replace Ignition Coils

• Tools Required: Socket set, multimeter.
• Sub-steps:
  1. Remove the ignition coils from the engine.
  2. Test each ignition coil with a multimeter for proper resistance (typically 0.5 to 1.5 ohms).
  3. Replace any faulty ignition coils with new ones.
  4. Reinstall the ignition coils securely.

4. Inspect Fuel Injectors

• Tools Required: Fuel pressure gauge, basic hand tools.
• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition on without starting the engine and check fuel pressure; it should meet manufacturer specifications (often around 40-50 psi).
  3. If pressure is low, inspect fuel injectors for clogs or leaks. Clean or replace as necessary.
  4. Reconnect fuel lines and ensure no leaks are present.

5. Check for Vacuum Leaks

• Tools Required: Smoke machine (optional), visual inspection tools.
• Sub-steps:
  1. Inspect all vacuum hoses for cracks or disconnections.
  2. If available, use a smoke machine to identify vacuum leaks in the intake system.
  3. Replace any damaged hoses or seals found during inspection.

6. Perform Compression Test

• Tools Required: Compression tester.
• Sub-steps:
  1. Remove spark plugs for easy access to cylinders.
  2. Insert the compression tester into the spark plug hole of each cylinder.
  3. Crank the engine for several seconds and record the pressure for each cylinder.
  4. Compare results with manufacturer specifications; low compression may indicate internal engine issues.