2000 Eclipse Error Code

This is just great. I changed the O2 sensor and got rid of the pesky service engine light, FOR TWO DAYS!!! Now I have it back again with a code of ** P1400 = Unknown Trouble Code**.:banghead:
Called my local Mitsu dealer, the service manager checked, they never heard of this code.
Anyone ever hear of it?
At least the O2 sensor code went away! :disappoin

clear it out and see if it comes back

P1400 Manifold Differential Pressure Sensor Circuit Malfunction (Mitsubishi)

i get it all the time.. one of the sensors may be loose tho.

Thanks for your feedback. I have cleared the code, when I start the engine it is gone. On the second start up it comes back. The annoying thing is that in PA, you cannot get a car inspected unless the check engine light is out, this damn thing keeps coming back. I wonder why the dealer is claiming insanity on this issue?