Definitely a chain on the 2002 SL1, They rarely break or stretch. However, they do have a recall that's good until 2017, unless you already had a new one put in I'd suggest taking it to a certified GM dealer and having it done. I had to replace a head gasket and got a chain just in case. 120,000 miles just figured it would need it. The chain I pulled out was identical to the new one, no slack or wear at all.
Also found this advice from another site:
Saturn does not recommend changing the timing chain at any mileage. In fact I owned a 96 SL2 that went 240,000 miles and never had the timing chain changed. When I later pulled the engine apart I found the timing chain to still be very tight and it showed no signs of ware. Also read this... "If only needs to be changed if it has excessive slack in it. Usually this is indicated by a noise that can be heard at idle and felt in the valve cover. It usually doesn't go away with increased speed. If you replace the chain, I'd also recommend changing the tensioner."
The V6 uses a timing belt. The 4 cylinder uses a timing chain.
The S series Saturn does not use a timing belt; all four cylinder Saturn's use a timing chain.
All of the 4 cylinder Saturns used a timing chain. The V6 engines used a timing belt.
All of the Saturn 4 cylinder engines used a timing chain. The V6 Saturn's used a timing belt.
Timing chain
The V6 Saturn used a timing belt. The 4 cylinder's used a timing chain.
this specific year came with a timing belt instead of a chain, even though it has the v6 engine, which surprised me as well
All of the 4 cylinder Saturn's used a timing chain. All of the V6 Saturn's used a timing belt.
All of the 4 cylinder Saturn vehicles used a timing chain. Only the V6 Saturn's used a timing belt.
All Saturn 4 cylinder engines have an internal timing chain. All Saturn V6 engines have a timing belt.
Chain
It has a timing chain.