is speed sensor the same as an ABS modulator? my ABS modulator is screwed up and i wanted to get it fixed. also, how do i know which one is screwed up?

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2000 A4 1.8T (FWD)

Sounds like one of the ABS senors has broken down if you have access to VAG this can be tested. Go into
brakes 03
Read measured value blocks 08
001
this will display the readouts of the ABS sensors for all four wheels, then just drive the car while monitoring the read outs and see if any are diffrent to the rest. If so the ABS sensor requires replacment.

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2001 A4 1.8T Q Casablanca White, Tip, ESP, Xenon and Premium

well i know the ABS modulator is messed up. i have the diagnostics from audi, but i was just wondering if the ABS modulator and the speed sensor were the same thing because if they are, it'd be cheaper for me to buy those, but i just need to know. thanks!

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2000 A4 1.8T (FWD)

The ABS computer is not the ABS wheel sensor.

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2001 A4 1.8T Q Casablanca White, Tip, ESP, Xenon and Premium

okay, thanks

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2000 A4 1.8T (FWD)

The abs modulator is located under the hood on the drivers side.. the speed sensors are at each wheel.. the modulator is fairly expensive to buy new.. you might want to try to find a good used one!