I was driving with the A/C on yesterday and the light came on "Service engine Soon"What may that indicate, I recently had some minor exhaust work done, not sure if that may have somthing to do with this.Any advice would be greatly appreciate.Thanks for your time and have a wonderful day.

Service Engine Soon

If the Service Engine Soon indicator light stays lit after you've started the engine, the On Board Diagnostics system (OBD) has detected a malfunction of the vehicle emissions control system. Contact your authorized dealer as soon as possible.
If indicator light is blinking, an engine misfire may be occurring, which could damage your catalytic converter. Drive in a moderate fashion (avoid heavy acceleration and deceleration), and have your vehicle serviced immediately.*
The Service Engine Soon indicator light illuminates when the ignition is first turned on (prior to engine start) in order to test the bulb, as well as indicate whether the vehicle is ready for Inspection/Maintenance (I/M) testing.
Normally, the Service Engine Soon light will stay on until the engine is cranked, then turn itself off if no malfunctions are present. However, if after 15 seconds this light blinks eight times, it means that the vehicle is not ready for I/M testing.Check this link out Gary.
https://owner.ford.com/how-tos/vehicle-features/dashboard-instrument-cluster/warning-lamps-and-indicators.html

There is a diagnostic procedure in the factory service repair manual for engine light lit ,no codes . Did you take it to ford dealer ? MIL - is referring to check engine , service engine soon etc...

• MIL always on when engine is running (no DTCs):
• MIL circuits

• For Focus, Mustang, Town Car, Continental, LS6/LS8, Escape, Windstar, F-150, Expedition and Navigator/Blackwood:
• Instrument Cluster, Section 413-01 of the Workshop Manual.
• All Others:
• GO to NB1

SERVICE ENGINE SOON indicator After the engine is started, the SERVICE ENGINE SOON indicator will prove out for a duration of three seconds. If the instrument cluster does not receive a message from the PCM within five seconds, the instrument cluster will illuminate the SERVICE ENGINE SOON indicator and log a diagnostic trouble code (DTC).

• An indicator is inoperative/always on - SERVICE ENGINE SOON

• Circuitry.
• Bulb.
• Instrument cluster.
• PCM.

• GO to Pinpoint Test P .

PINPOINT TEST P: AN INDICATOR IS INOPERATIVE/ALWAYS ON - SERVICE ENGINE SOON CONDITIONS DETAILS/RESULTS/ACTIONS P1 CARRY OUT THE INSTRUMENT CLUSTER SERVICE ENGINE SOON INDICATOR ACTIVE COMMAND Trigger the HEC active command MIL.

• Did the SERVICE ENGINE SOON indicator illuminate?

Yes REFER to Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No INSTALL a new instrument cluster; REFER to Instrument Cluster . CLEAR the DTCs. REPEAT the self-test.

A flashing check engine light indicates active engine misfire. There should be codes set for these conditions. It could be low fuel pressure, but if you have not replaced the spark plugs and wires, I would look there. Failed ignition coils or ignition module can be culprits. Also plugged exhaust (catalytic converters) could be to blame as well. To test the catalytic converters, remove the oxygen sensors between the engine and converters and go for a drive. You can also unbolt the converters and run open exhaust. It will be loud, but if performance improves and normalizes, your exhaust is plugged and you will need to replace the converters.

The service engine soon could be an indicator that you need to have minor maintenance done in the near future. I had a Grand Am that the service engine light would turn on when I was getting close to needing an oil change. You might check your owners manual for an exact reason as to why it turns on.

Head gasket is leaking antifreeze into the cylinders but it is very minor now, soon you wont be able to drive.

service vehicle soon light on ? Does not indicate a electrical problem. Have it checked for DTC'S - diagnostic trouble code's Has to do with OBD2 engine management system .
Window's an A/C not working are two other separate problems . Looking at wiring diagrams an testing the electrical circuit's for the windows and A/C is how to find the problem . Your best bet mite be to take your vehicle to a qualified repair shop.

this could be caused by poor gas, or intake and exhaust vanos solenoids, first try filling the tank with high test gas with low ethenol content,run through a couple of tanks, if still occuring your solenoids may be gummed up, they are located at the front of the cyl head and help in by 1 10mm screw, remove and blow clean with compressed,also be sure to change your oil more freequently than cbs indicator suggests.

The service engine light is totally safe. If it's just the ABS light, it's safe as long as you don't panic stop on the way to the shop.

This happens when your odometer reaches a set milage,indicating mantainance.Just what needs service I don't know.If you do nothing your check engine light will stay on soon.Many Pep Boys, Auto Zone will read your onboard diagnostic for nothing ( a small Tip is expected ).Then you'll know what it is.Don't rush into repair.Get estimates.It could be very minor..Filters or mid... EGR Valve ,Cat Converter.Good Luck

QUITE SIMPLE THE SERVICE INDICATOR NEEDS TO BE RESET AGAIN YOU MIGHT HAVE TO TAKE IT TO RANGE ROVER DEALER THOUGH.