Transmission Problems? Ask a Mechanic for Answers ASAP
Since there are no codes, this means it is not an electrical issue to blame. I assume you have verified there are no trans warning lights on and no codes stored. That means it is an internal issue with the transaxle associated with the valve body or the intermediate clutch. You mentioned wanting to replace the OSS sensor, I assume the speedometer does not work since your wanting to replace it. It is on the top of the transaxle, above where the passenger axle shaft connects.
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It would not start in most cases if the TR sensor were bad. Below is an image of the OSS.