Check engine light on with a code reading P1241 on 2001 Volvo S40

The light came on after we pushed the button to put the car in winter mode. Have disconnected the battery and the light is still on. took it to autozone and the code they got was P1241

Asked by for the 2001 Volvo S40
are you sure about that code i can not find
yes that is the code print off the guy gave me..i have looked it up and i keep getting different possible problems.. one says its the sensor power supply low input and another saysEngine Boost Condition Signal Too High