I too am having a speedo fluctuation problem. Only difference is that the dealer told me there's 2 speed sensors - 1 on the transaxle and another at the instrument cluster.

I believe my problem is the sensor in the dash. WHY? The last time I had the car on the highway the speedo was reading (240KMH) way over the speed where the fuel cutout comes in and it did not. As long as the PCM reads the transaxle sensor and not the dash sensor, this is my problem.

Of course, the dash sensor is the more expensive of the 2!

My car is an early Duratec powered MTX.


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