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1999 Windstar trans.

2K views 7 replies 4 participants last post by  sayfinee 
#1 ·
Recently installed a used 3.8 engine and AX4S transmission. Worked fine for about 3 weeks then intermittently the trans. won't shift and the "o/d off" light flashes. First start-up in the morning tends to work fine, but at first stop, problem starts. Has P0720 DTC. Understand that this is speed sensor circuit. Would like to know where are the most common vulnerable points for this code. Oddly, transmission worked fine all day yesterday. (July 30)
 
#7 ·
Before spending the money on the sensor, try cleaning the connector. The car has a little age on it, corrosion happens. I've had to clean several connectors on our 04 Pontiac. Spray some electronics cleaner on the male and female pins, then apply some dielectric grease.
 
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