SOURCE: o2 sensor location
What engine do you have? Does your car have a V6 or a four-cylinder? Regardless of the engine, you will have an O2 sensor after the catalytic converter. On a four cylinder you'll have one in the exhaust manifold as well. On a V6 you'll have one sensor between the engine and cat, and one after each cat as well. The sensor(s) before the cats determine your fuel mixture, and the after-cat sensor(s) are used to monitor the efficiency of the cat.
SOURCE: location of ECT sensor
when you open the hood take your right hand and follow the upper rad hose down to the eng. when it stops thats the themostat housing the ect sensor is screwed into that housing there are two sensor one will have one wire and the other will have two you want the two wire one. be carful remove the conector the like to break good luck kdc744
SOURCE: Cam Shaft Position Sensor 1998 Saturn SL
Have a look at this link, scroll to your engine & click on picture to expand for better view.
http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528017e904
SOURCE: 1999 Saturn sl speed sensor
The vehicle speed sensor (VSS) is located in the differential area of the transaxle. Also, to replace it should be fairly simple. I wish I could give a better answer exactly where it is at, but I have you the answer straight out of the Haynes manual.
To replace the VSS, disconnect the electrical connector from the VSS. Then remove the retaining bolt and lift the VSS from the Transaxle or simply unscrew the VSS. Installation is the reverse of removal.
SOURCE: where is the coolant temperature sensor
These are located in the cylinder head in the back of the head...meaning 180 degrees from the belts and pulleys(front) or the side the transmission is on. Two sensors exist...the single wire sensor is for the dash gauge. Saturn pn# 21025106 is the one you need
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