why does my Toyota RAV4 XA50 (2019-2024) check engine light turn on and off

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Address Fault Codes

• Using the OBD-II scanner, retrieve and note the fault codes.
• Research the codes to identify potential issues (e.g., P0420 for catalytic converter efficiency).

3. Inspect and Replace Components

• Gas Cap:

  • Remove the gas cap and inspect for cracks or wear.
  • Replace with a new gas cap if damaged.

• Air Filter:

  • Open the air intake cover and remove the air filter.
  • Inspect for dirt and debris; replace with a new filter if necessary.

• Ignition Components:

  • Remove spark plug wires and inspect for wear.
  • Replace spark plugs with OEM specifications and reassemble.

• Fuel System:

  • Connect the fuel pressure gauge to the fuel rail.
  • Start the engine and check the pressure; replace the fuel filter if pressure is low.

4. Reconnect and Test

• Reconnect the battery.
• Clear the error codes using the OBD-II scanner.
• Start the engine and monitor for any warning lights.