what do these CEL mean?

[Sephroth57]

P0125 Excessive Time to Enter Closed Loop Fuel Control.
P1400 Manifold Differential Pressure Sensor circuit.

what do these mean in english? what do i need to replace?

also if it helps my front o2 sensor is dead and new one is on the way, but its not showing a code for i found out by looking at o2 readings on my logger

 

[Sephroth57]

anyone?

 

[luv2rallye]

An technical explaination would be very long and pointless. The end result would be that the P0125 is caused by a bad front O2 sensor or connector and P1400 is faulty MDP sensor or connector. These are what you need to check/replace.