why does my Volvo XC90 Second Generation (2015-2024) engine light keep coming on

Solution

1. Preparation

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

2. Addressing Error Codes

• Connect the OBD-II scanner and note the error codes.
• Research specific codes to determine the faulty component (e.g., P0420 for catalytic converter efficiency).

3. Replace Faulty Components

• If spark plugs are faulty:

  1. Remove the ignition coils using a socket set.
  2. Extract old spark plugs with a spark plug socket.
  3. Install new spark plugs, torquing to manufacturer specifications (typically 15-20 ft-lbs).

• If vacuum leaks are found:

  1. Inspect and replace damaged hoses or gaskets.
  2. Use a smoke machine to check for leaks if necessary.

• If the gas cap is faulty:

  1. Remove the old gas cap.
  2. Install a new gas cap, ensuring it clicks into place securely.

4. Reconnect Battery and Clear Codes

• Reconnect the battery and clear any stored error codes with the OBD-II scanner.
• Start the engine and check for any re-illuminated check engine light.