# 1999 Mercury Sable 4 Door Sedan

**URL:** <https://community.cartalk.com/t/1999-mercury-sable-4-door-sedan/85209>\
**Category:** Maintenance/Repairs\
**Created:** [May 29, 2014, 3:25am UTC](https://community.cartalk.com/t/1999-mercury-sable-4-door-sedan/85209 "2014-05-29T03:25:30Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Gail\_Ward](https://avatars.discourse-cdn.com/v4/letter/g/d07c76/32.png) [@Gail\_Ward](https://community.cartalk.com/u/Gail_Ward)\
**Post date:** [May 29, 2014, 3:25am UTC](https://community.cartalk.com/t/1999-mercury-sable-4-door-sedan/85209/1 "2014-05-29T03:25:30Z")

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Intermittent cruise control and speedometer problem

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**Author:** ![Gail\_Ward](https://avatars.discourse-cdn.com/v4/letter/g/d07c76/32.png) [@Gail\_Ward](https://community.cartalk.com/u/Gail_Ward)\
**Post date:** [May 29, 2014, 3:26am UTC](https://community.cartalk.com/t/1999-mercury-sable-4-door-sedan/85209/2 "2014-05-29T03:26:32Z")

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Need advice on how to fix this problem

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [May 29, 2014, 3:35am UTC](https://community.cartalk.com/t/1999-mercury-sable-4-door-sedan/85209/3 "2014-05-29T03:35:49Z")

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Is the Check Engine light on?

Tester

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**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\
**Post date:** [May 29, 2014, 4:09am UTC](https://community.cartalk.com/t/1999-mercury-sable-4-door-sedan/85209/4 "2014-05-29T04:09:37Z")

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Make sure all the speed sensors on the transaxle are working correctly

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**Author:** ![Gail\_Ward](https://avatars.discourse-cdn.com/v4/letter/g/d07c76/32.png) [@Gail\_Ward](https://community.cartalk.com/u/Gail_Ward)\
**Post date:** [May 29, 2014, 4:40am UTC](https://community.cartalk.com/t/1999-mercury-sable-4-door-sedan/85209/5 "2014-05-29T04:40:58Z")

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No the check engine light is not on.

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**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\
**Post date:** [May 29, 2014, 6:49am UTC](https://community.cartalk.com/t/1999-mercury-sable-4-door-sedan/85209/6 "2014-05-29T06:49:57Z")

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More than likely a speed sensor problem; CEL or no CEL.

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**Author:** ![ken\_green](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/ken_green/32/816_2.png) [@ken\_green](https://community.cartalk.com/u/ken_green)\
**Post date:** [May 29, 2014, 8:37pm UTC](https://community.cartalk.com/t/1999-mercury-sable-4-door-sedan/85209/7 "2014-05-29T20:37:43Z")

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Back in those mechanical days, the speed sensor is driven by a plastic gear…prone to wear. That needs checked as well. Remove the speed sensor from the transaxle and look. The gear has angled teeth but the surface of those teeth should be level, not concaved.  
Look down in the hose where the speed sensor goes…the gear down inside should also not be concaved.  
A worn out gear may be spinning sometimes but lose contact with the drive gear explaining an intermittent proble for both the speedo and cruise.