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My car started having an abrupt shift between 4th & 5th gears about 6-8K miles ago. Then about 3K miles ago, it started trying to hunt between gears after leaving from a stop. It would always engage right away after depressing the gas pedal. It gave codes for the speed sensor as well as the PRNDL (gear selector switch) These were replaced and only briefly curing the problem. No codes ever came up for the throttle position sensor. Also, while crusing at freeway speeds 70 plus, it would want to down shift like I was passing someone.
Someone on the VolvoSpeed site suggested the TPS. My local Volvo dealer (here in north Florida) wanted $105 for it, but I go through a Volvo in Brentwood, MO. They wanted $66 plus $8 shipping. Call 1-800-844-9502 and ask for Richard in parts, tell him Bob Baker in Florida recommended you. He has helped me out so many times in the past for all my Volvo cars that I have.
I hope this helps everyone......Good luck.
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