I fixed a 1996 Lincoln Town Car problem with the door latches using the WD40 routine.
Several of the complaints refer to the service engine light coming on, and it being an O2 sensor, but replacement did not fix it. Here is probable solution:
The passages in the throttle body are gunked up with carbon, not allowing any oxygen to the sensor. Pull the throttle body, clean out the passages, including the "C"shaped one, be careful not to ruin any wires, etc. If you clean the throttle body throat, be very careful. DO NOT break the MAF sensor wires. You can spray them with MAF cleaner if you are careful.
This appears to be a Ford problem; almost all the Taurus, Sable, Ranger, F150, etc. eventually have the same problem. Hope this helps.
My 2002 Sable had water on the passenger side floor, and I traced it to the fan blower motor, which is on right side under the dash, and right below the cabin filter. The cabin filter is accessible from a cowling under the hood and right under the windshield. That is where the water gets in. Hard to get it sealed tightly; eventually the blower motor rusts from the water or burns out control relay. I drilled a small hole at the bottom of the blower casing (not too deep, and at an angle) to allow any moisture to seep out of the blower motor. I also silicon-ed all around the cabin filter cowling.
I bought my Mercury Sable GS 1996 with 48775 miles on it about a month ago. I paid 2350.00 for it. Pretty good buy I guess. The only problem so far is that pesky dome light. But after reading some of these comments: I'll know what to do. Thanks to "Wd40". And to all of you people. THANKS!
More than likely it is your sync shaft; it syncs all your mechanics of your engine via sensing a spinning shaft, so if it's off, so is your car.
I had the problem also with the O2 sensor, but I replaced the wires and plugs, and the problem didn't read anymore. Also the check engine light is not on anymore.