could be either speed sensor on gearbox, speed convertor on back of dash.
Or if it is a WRX and has a speed delimiter wired in to the ECU these are prone to fail.
if so bypass it to see if fixes. the box will have power,ground and 2 wires.
these 2 wire join to one wire on the ecu and one wire in the loom (it's the same wire just cut), remove speed delimiter wires and rejoin existing ecu wire together.
Car will run fine bypassed but you won't be able to go above 112mph
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