* No Light: Many vehicles from that era relied on the owner's manual and a sticker in the vehicle (usually near the driver's side doorjamb) to track maintenance intervals. There may be no light at all. Check your owner's manual for the recommended maintenance schedule.
* Check Engine Light (CEL): If there's a light illuminating, it's far more likely to be the Check Engine Light (CEL) indicating a problem detected by the onboard diagnostics (OBD) system. This isn't a "maintenance required" light, but rather a warning of a potential issue that needs attention. A code reader would be needed to diagnose the CEL. Simply resetting it without fixing the underlying problem is not recommended.
* Oil Change Light (If Equipped): Some higher-spec 1991 Cherokees *might* have had a simple oil change indicator light. This often required manually resetting it after an oil change. The method varied slightly depending on the exact year and options. Some involved simply turning the ignition on and off a specific number of times while watching the light, while others required a more complex process sometimes involving a jumper wire between two terminals. Again, your owner's manual is crucial here.
To find the answer, you MUST consult your owner's manual. This is the only reliable way to determine if your specific 1991 Jeep Cherokee Laredo has any kind of maintenance indicator light and how to reset it (if applicable). If you don't have the manual, you can often find a PDF version online by searching for "[Year] [Make] [Model] owner's manual" on a search engine.
In short: Don't rely on generic advice. Find your owner's manual! If there's a problem indicated by a light (not just an indicator light), address the underlying cause, not just the light.
