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If you're having problems with your cruise control, I would suggest that you check into your Subaru's transmission and engine error codes to see what it's returning if anything. Many times the problem with the cruise can be diagnosed by the vehicle itself. The car will not allow the cruise control to function if it knows about a specific problem, which will be given in the error codes. I don't know what year subaru you have, but look into getting both the engine (check engine light) error codes and the transmission (power light) error codes on your Legacy to see what they're returning. My speed sensor was out on my Subaru. Once I found the problem in the error codes, I swapped it out and my cruise worked just great.
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First you need to troubleshoot the 1994 LeSabre cruise control. Check the fuse, the cruise switch, the linkage, to find where the problem is. Check the vacuum lines on the engine as a vacuum leak can cause the cruise to not work properly.
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