UPDATED: Carbon monoxide alarm goes off while baking in oven

My oven does the same thing at times.
Detectors have expiration dates on them.
There are 2 types of detectors Ion and photo, some people use both types.
Try moving the detector to another location, it might be too close to the oven.
Use the overhead vent to exhaust to the outside before you open the oven door.

more detector info, rv net thread