To locate it *precisely*, you'll need to:
1. Determine your transmission type: Check your vehicle's documentation (owner's manual or vehicle identification number (VIN) lookup) to find out if you have an automatic or manual transmission. Even within automatic or manual, there were variations.
2. Consult a repair manual: A repair manual specific to your year and model Alero (Chilton, Haynes, or a factory service manual) will have diagrams showing the exact location of the speed sensor for your particular transmission. This is the most reliable method.
3. Look online: Search for "[Your Alero's Transmission Type] speed sensor location" along with the year and model. Images from online forums or repair sites might help you visually identify it. However, always double-check against a repair manual for accuracy.
General areas to look: The speed sensor is usually near the output shaft of the transmission. It's often a small, cylindrical sensor with a single wire connected to it. Expect it to be somewhat difficult to access, requiring some potential removal of other components to get a clear view.
