Fault code P1105 from a Mercedes-Benz car means a problem with the atmospheric pressure sensor in the control module. The problem may be located with the fuel and air metering subsystem of the powertrain system.
Possible problems indicated by an on-board diagnostic trouble code of P1105 are an altitude pressure sensor control module fault, an atmospheric pressure sensor readout that is too large or too small, high pressure at the sensor controller, or a manifold absolute pressure sensor malfunction.
The car's computer system performs the on-board diagnostic process using sensors located throughout the vehicle. A diagnostic trouble code can indicate a problem with the vehicle, or it can indicate a faulty sensor.