One problem related to engine knocking noise has been reported for the 2000 Saturn LS. The most recently reported issues are listed below.
Engine began having a slow knocking noise, prior to that I would hear a noise of the chain slapping, which I was explained to by Saturn that this was normal in my vehicle. Drove the vehicle home then while I was parking, heard a loud bang and when I got out - there was oil gushing from underneath. Parked the car and have not repaired it since. . . Was just doing research now to replace the engine and found that finally there was another round of recalls regarding the engine. I have asked my Saturn dealer before about this (while they were still in business) and was told that only specific years were covered. . .