I have a 99 Windstar that has had the "O/D lockout" indicator flashing on,
with troubles shifting out of 1st gear. My local Autozone scanned it as
P0720. The local Ford dealer quoted me $300 labor & $60 part plus tax to
replace the vehicle speed sensor (this in addition to $112 already charged
The van is still sitting at the dealer's - I told them to hold off on doing
any work, because this price seemed way too high to me. I'm not a skilled
mechanic, but I have the shop manual, and unless I'm missing something, it
doesn't look like this is a real involved job. The 95-98 Haynes manual said
the crossover pipe has to be removed, but the specific 1999 Ford shop manual
says nothing about having to drop any exhaust components. I talked to a
local transmission shop and they said they thought the whole job would be
Is the dealer trying to hose me? What would be a reasonable charge to pay a
mechanic to replace the VSS? Thanks for any advice you can give.
First of all this P0720 is the trans output shaft speed sensor or OSS. A VSS
code is P0500
speed sensor inputs a signal to the PCM, based on the speed of the output shaft
of the transmission. The PCM compares this signal with the signal of the VSS or
TCSS and determines correct tire size and axle gear ratio. Possible causes; OSS
sensor circuit short to GND
OSS sensor circuit short to PWR
OSS sensor circuit open
Damaged OSS sensor
Verify sensor signal output varies with vehicle speed.
Output Shaft Speed (OSS) Sensor
If equipped, turn the air suspension switch off.
Disconnect the battery ground cable.
Raise and support the vehicle. .
Remove the heat shield.
I can't post pictures but if you send me and email firstname.lastname@example.org I
Disconnect the output shaft speed (OSS) sensor connector.
Remove the OSS Sensor cover.
Remove the connector.
Remove the bolt.
Remove the cover.
Remove the OSS sensor.
NOTE: When the battery (10655) is disconnected and reconnected, some abnormal
drive symptoms may occur while the vehicle relearns its adaptive strategy.
Follow the removal procedure in reverse order
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