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Throttle Position Sensor Replaces: Mercruiser 805226A1 / Volvo 3855184 Fits: MCM / MIE V6 & 305, 350, 454, 502 EFI A throttle position sensor (TPS) is a sensor used to monitor the position of the throttle in an internal combustion engine. The sensor is usually located on the butterfly spindle so that it can directly monitor the position of the throttle.