I would check the driver's side dash to see if the "check engine" light came on; if so rent an OBD-I reader (specific to GM cars) from your local auto parts store.
Once you retrieve the trouble code, go to the following website to interpret the code fault:
2008 Acura MDX Sensor Location
The title of the above link is misleading; it will bring you to the "GM OBD1 Codes Retrieval For Pre 1996 GM Vehicles" page. It is a single page reading, dedicated to the GM OBD-I DTCs; please read it first before attempting to pull the codes.
From there, you'll be able to get a general idea of where or what to look at, in the diagnostic/troubleshoot process, instead of the guess and try method.
For future reference, you should detail more information as to what led up to the problem; or what is actually happening; and what repairs were attempted to correct the problem...it'll certainly lower, if not take the guess factor out of the troubleshooting process.
If you need more help, there are plenty of assistants to help. :)