They are on the exhaust 1 before the cat and 1 after the cat the usually have 4 wires going to them 2 white and 2 gray
let me know if this helps
cheers mike
SOURCE: 1998 ford explorer speed senors
The VSS was deleted for 1998. The vehicle speed signal is generated by the rear anti-lock brake sensor and sent to the 4-wheel anti-lock brake system (4WABS) module. The 4WABS module sends the vehicle speed signal via circuit 679 (GY/BK) to all systems which require a vehicle speed signal input.
Did you recently change tires to maybe a different tire size. If so this may be your problem.If so to correct this you would have to have this calibrated into the PCM with a scan tool.
There is also a technical service bulletin out for harsh downshifts the number is 99-8-7. This requires a reprogram of the PCM.
hopes these diagrams help once they have been censored
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