Have you run a oncheck -cD 2097250 yet? If you can figure out which database and table, you should try running the following.
oncheck -cDI <name of database> "informix":<name of table>
I had a lot of problems with bad data pages and/or indexes. This command will allow you figure out if it is an index problem or a data page problem. If it is an index problem, it's easy to fix. Drop and recreate the index. However, if it is a data page problem, you may have restore to another location, unload the table giving you the problems and then load a good table into production.