is it p0100, you can look here,
if it is this code, the solution may:
The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures:
Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires.
Unplug and reconnect the MAF wiring harness
Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information)
Replace the MAF sensor