I would venture to guess it's just a bad sensor. It could be the control mod, but doubtfull. If when you get back you find the light is 'off' when you start the car, drive it and see. If it starts acting up, then I'd do as Paul suggested. Could just be a 'one time' thing too ... if there was oil that had come up from the rain and maybe you didn't see it, but the ABS did.
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CAI, Test Pipe Cat, JDM N1 Cat back, FSTB, Aluminium dash kit, STS, Razo shift knob, Clear markers, CC mod, .ORG Stickers (bright blue), Blue LED switches / map lights, A6 Bi-Xenon retrofit, rebuilt 5spd - My write up -->
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