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post #1 of 8 (permalink) Old 07-30-13, 09:39 AM Thread Starter
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1999 Windstar trans.

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)

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post #2 of 8 (permalink) Old 07-30-13, 06:04 PM
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Re: 1999 Windstar trans.

The flashing OD light indicates a diagnostic present, getting it scanned will let you know which code. Check fluid level and condition, may give you an indication.

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post #3 of 8 (permalink) Old 07-31-13, 04:43 AM
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Re: 1999 Windstar trans.

Most likely, the computer saw something happen in the transmission that was enough to trigger the OD light to flash. Most likely, a code was set in memory. To retrieve the code most parts stores will allow you to pull codes for free with a code reader.
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post #4 of 8 (permalink) Old 07-31-13, 06:26 AM Thread Starter
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Re: 1999 Windstar trans.

Thanks Jeff. As indicated previously, I have scanned it and found the P0720 dtc . Trans. fluid is at normal level and colour.
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post #5 of 8 (permalink) Old 07-31-13, 09:53 AM
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Re: 1999 Windstar trans.

•P0720 Output Speed Sensor Circuit Malfunction

OBDII Code P0720 FORD - Output Speed Sensor Insufficient Input | HelpForCars.net

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post #6 of 8 (permalink) Old 07-31-13, 01:15 PM Thread Starter
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Re: 1999 Windstar trans.

OK Bert, should I be looking at replacing the speed sensor or looking for a faulty circuit?
Sorry Bert, thank you. I was a little hasty and did not look at the code explanation.

Last edited by sayfinee; 07-31-13 at 01:20 PM. Reason: Incomplete
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post #7 of 8 (permalink) Old 07-31-13, 05:43 PM
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Re: 1999 Windstar trans.

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.

Ever notice that there's so many high performance parts available for GM products?

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post #8 of 8 (permalink) Old 08-01-13, 08:45 AM Thread Starter
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Re: 1999 Windstar trans.

Thank you Cskr! Will try that.
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