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i thought if the speedo didnt work the car woulndt hit vtec, the car has to be going 20 mph in order to hit vtec so if the speedo not work the computer wont engage the vtec.
^^ I dont know how true that is cause sometime my speedo doesnt work but vtec still works regardless if the speedo works or not, then again im not throwing a CEL for speed sensor either so idk