1996 Ford Explorer Owner's Manual - Page 101

Fuel Economy cannot be reset. That is, these three features are unaffected by pushing the RESET switch. System Check A press of the SYSTEM CHECK switch causes the M/C to cycle through a status of each of the systems being monitored. For each of the monitored systems, the M/C will indicate either an OK message or a warning message for two seconds. The sequence of the system check report is as follows: s Engine Oil Life Left s Engine Oil Level s Voltage Level s Engine Coolant Temperature s Washer Fluid Level s Head Lamps s Tail Lamps s Brake Lamps s Air Ride System (if equipped) s Fuel Level At normal conclusion of the system check sequence, the M/C will display the last displayed feature before pressing the SYSTEM CHECK switch or the warnings that are active. For two of the systems reported in the system check (Engine Oil Life Left and Fuel Level), there are two messages to describe the status of the system. For Engine Oil Life Left, the first message will indicate the oil change status (OK, SOON, REQUIRED) and the second message will indicate the oil life remaining as a percentage. If the second message is "OIL TEMP SIGNAL ERROR", this means that there is a problem with the oil temperature sender system and you should contact your dealer 100