Automatic Level Control Sensor (electronic air ride sensor) w/ Link for rear suspension (air shocks) Mounts by the left rear wheel. Tested - confirmed proper operation. GM Part #: 22153656 (also 22149496, 22149673, 22153608, 22153909). NOTE: The only exception to the above list is that some Cadillac Sevilles of this era do not use this sensor, but rather use a different sensor (part # 25728489) at the left rear wheel, which I also have in stock.Here is how to know which one you need: The Sevilles with 4-wheel real-time shock dampening have a sensor at each wheel, and they use that other sensor (# 25728489) at the left rear wheel. The Sevilles without 4-wheel real-time dampening only have one level sensor (located at the rear left control arm), which is solely for the rear shock leveling system, which is THIS LISTING, part # 22153656. The other cars listed above are straightforward, all using the sensor in this listing (part # 22153656). This part has been treated and painted to improve surface condition. The metal components typically developed rust (due to the mounting location on the vehicle), but did not affect the operation of the part. There are several components in the electronic level control system. If you are in doubt as to the faulty part, feel free to contact me. I carry a full line of level control air compressors and height sensors for GM vehicles. Let me know what you need and I can get it for you! Closed Saturdays: In honor of the biblical Sabbath, customer service will not be available on Friday evenings or Saturdays during the day. Buyers are requested to refrain from purchasing during those times. The item "Level Control Sensor GM OEM 22153656 with Link, Tested + Warranty + Priority Mail" is in sale since Monday, January 5, 2015. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Suspension & Steering\Shocks & Struts". The seller is "kaspr" and is located in Mora, Minnesota. This item can be shipped worldwide.