if your car is still running fine it usually an o2 senser
The 2006 Volvo C70 has an inline 5 engine.
The 2006 Volvo S80 has an inline 5 engine.
The 2006 Volvo S60 has an inline 5 engine.
The 2006 Volvo XC70 has an inline 5 engine.
The 2006 Volvo XC90 has an inline 5 engine.
With a scan tool.
I think it means you need to check your engine.
The check engine light comes on when the engine computer detects a malfunction and sets a trouble code.
The 2006 Volvo S60 has a 2.5 L base engine size.
The 2006 Volvo C70 has a 2.5 L base engine size.
The 2006 Volvo XC70 has a 2.5 L base engine size.
The 2006 Volvo S80 has a 2.5 L base engine size.