* Vehicle Speed Sensor (VSS) (for speedometer and other systems): This is the most common speed sensor. It's usually located on the transmission. For a 2002 Blazer, it's most likely found on the output shaft of the transmission case. You'll need to get under the vehicle to see it. It's a small sensor with a single wire connector.
* Transfer Case Speed Sensor (for 4WD only): If your Blazer is 4WD, there's a second speed sensor in the transfer case. Its exact location within the transfer case varies, but it's typically on the side or bottom. You'll need to get under the vehicle and likely consult a repair manual or diagram specific to your transfer case type.
To find the VSS (the most likely sensor you're looking for):
1. Consult a repair manual: A Chilton's or Haynes repair manual specific to your 2002 Chevy Blazer will give you the exact location and images. This is highly recommended to avoid misidentification and unnecessary work.
2. Get under the vehicle: You'll need to be able to see the bottom of the transmission. Use jack stands for safety!
3. Look for a small sensor near the transmission output shaft: It will have a single wire harness connected to it.
Important Note: Before attempting any repairs, disconnect the negative terminal of your battery.
Without knowing your specific Blazer's drivetrain configuration (2WD or 4WD, automatic or manual transmission), pinpointing the *exact* location is impossible. A repair manual is your best bet for accurate information.
