I just pulled the rear bench seat out and checked the rear sensor at the connector. The resistance looks okay at about 750 ohms. I then connected the digital ac voltmeter and went for a short drive. The ac volts went up smoothly to about 1.5 volts at 25 mph. I reconnected the sensor and put everything back together.

After driving the car daily for a while, the pattern remains the same. When the car is first started in the morning, the light comes on (and latches on) within a minute or so of driving. If I stop and restart within five minutes, it repeats the same problem. However, once the car is warmed up, the light stays out when restarted--even if the car sits for a few hours and is driven later in the day. The problem is driving me batty.

I have done a few things over the past year in the neighborhood of the sensors, like replace the struts and drain and refill the differential with synthetic. But the ABS worked fine for several months before this intermittent light started.

Any more thoughts out there?

Thanks.
Brent Smith
1986 300E 273,000 miles