my Toyota RAV4 engine light comes on and off what's causing it

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shock.

2. Address Fault Codes

• Use the OBD-II scanner to clear any fault codes after repairs are made.
• If specific codes are identified (e.g., P0420 for catalytic converter efficiency), proceed with repairs related to those codes.

3. Inspect and Replace Components

• Gas Cap:

  • Remove the gas cap and inspect for damage. If damaged, replace it with a new one.

• Air Filter:

  • Remove the air filter housing cover using a socket set.
  • Take out the old air filter and replace it with a new one.

• Battery Check:

  • Inspect battery terminals for corrosion and clean them with a wire brush.
  • Ensure the battery is securely fastened and connections are tight.

4. Test Drive and Monitor

• Reconnect the battery and start the engine.
• Conduct a test drive to monitor engine performance and observe if the check engine light reappears.