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sprinkles08, ASE Certified Technician
Category: Lincoln
Satisfied Customers: 23114
Experience:  ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
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Have 99 navigator speedo works cold then drops to 0 trans

Customer Question

have 99 navigator speedo works cold for seconds then drops to 0 trans shifts hard
Submitted: 2 years ago.
Category: Lincoln
Expert:  sprinkles08 replied 2 years ago.

Hello and welcome to Justanswer!

It does sound as if you're losing output speed sensor signal. The output speed sensor signal is used both for the speedometer and for transmission shifting functions. The loss of speedometer could be an instrument cluster issue but if you have shift problems at the same time then most likely you're losing output speed sensor signal. If the sensor was replaced with a good part then then issue could be in the powertrain control module but is most likely a wiring or connection issue.

Do you know what fault codes are setting?