You don't need a code reader to reset the light on a '94 (actually it can't be done with one). Access the box labeled "A" next to the washer refill tank under your hood to do this. You'll want to read your codes first...and since you were able to get 2-4-1, obviously you know how to do this. Resetting is easy but it has to be done quickly. Put the lead in socket 6 of "A" box, and run through the test (you can't delete the codes until they've all be read) as you did before, then press the test button and hold it down for about 5 seconds and release. After 3 seconds, the LED will light (now quickly), press and hold the test button for another 5 seconds and release. The LED will go out. Switch off the ignition....you're done. The CEL should now be off.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon