how to fix a check engine light that keeps coming on in my Toyota RAV4 XA40 (2013-2018)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Replace Faulty Components

• If codes indicate misfire (P0300-P0304):

  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the negative battery cable.
  3. Remove and inspect spark plugs; replace if worn or fouled.
  4. Inspect and replace ignition coils as needed.

• If vacuum leaks are found:

  1. Identify and replace damaged vacuum hoses.
  2. Repair or replace the intake manifold gasket if it shows signs of wear.

3. Check and Repair Fuel System

• If fuel system issues are indicated:
  1. Inspect fuel injectors for clogs or leaks.
  2. Clean or replace fuel injectors as necessary.
  3. Replace the fuel filter if it hasn’t been changed in a while.

4. Reset the Check Engine Light

1. Reconnect the negative battery cable.
2. Use the OBD-II scanner to clear the error codes.
3. Start the engine to check if the check engine light remains off.