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The 2001 BMW 525i features a few speed sensors, each located in different areas. The wheel speed sensors are situated in the wheel hubs, while the key one is the transmission speed sensor, responsible for your speedometer and odometer. These are essential safety components that you'll want to keep operational. Manual transmission models do not have this sensor, so this information applies only to automatic models. The TSS is typically located on the tail shaft of the transmission, making it easily accessible. You can spot it by getting under the car and looking towards the rear side of the transmission.
The speed sensor for the 2001 BMW 525i is situated on the transmission's side.