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Dude honestly......and Iam sure others will follow me on this one.....Return it....get your money back....its worthless.....you can you the same thing by pushing your foot down on the accelerator....and opening it up.........
Alll this switch does is trick the computer. When you give it 3/4 throttle the computer believes it is WOT.....and so you feel like you are going faster etc etc..........
If you're using that switch thing, make sure your TPS is set at .54 at idle. Any higher and that switch thing will screw up your WOT voltage.
If the light comes on as soon as the car is turned on then I'd say that switch is bad. I've heard a few people had the same problem and returned the switch. Most likely you're getting a code 33 or 34 if you checked what code is being set off.
But, it is pretty much worthless. I can't believe companies sell that thing for $99 and sleep at night.