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The TPS on my ’95 850 failed at about 50k miles. The failure mode manifested as sporadic shifting at constant freeway speeds and loads. Removal and probing with a DVM indicated a discontinuous voltage (resistance) reading that got worse with temperature soak. Replacement solved the problem. Interestingly there were NO OBDII codes. The resistance readings were always within spec; the computer was interpreting the faulty readings as an erratic right foot and tried to compensate as best it could.
Kind of reminded me of HAL in 2001…
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