WERE IS THE OUTPUT SPEED SENSOR LOCATED ON THE VW JETTA 2005 2.5 L 5 CYLINDER

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I HAVE BEEN HAVING REALLY BAD CAR TROUBLE THE car bucks,jerks when you try to accelerate.speed DON'T WORK PROPERLY 2 WEEKS AGO THEY CLEARED THE CODE BUT THE CAR IS STARTING UP AGAIN DOING THE SAME THING I DONT KNOW WHAT TO DO I WAS ALREADY FULL ONCE THEY CHARGED ME CLOSE TO 500.00 FOR A TRANSMISSION FLUSH THAT WAS NEVER DONE AM A SINGLE MOM WITH 4 KIDS I CANT AFFORD TO BE FULL LIKE THAT THIS IS VERY HARD I DONT KNOW WHO I CAN TRUST VW DEALER SAYS I HAVE TO GET A NEW TRANSMISSION 5000.00 DOLLARS AND I CANT AFFORD THAT HELP PLEASE ????