There is one right in front usually in the exhaust manifold. You may have a secondary one behind the catalytic converter. There is only one sensor until 1996. This is according to the Haynes 1991-1999 Auto Repair Manual.
Check
were is crankshaft sensor located in 2001 Saturn l300
Engine coolant temperature switch/sensor
Just to clarify — the 1995 Saturn SL has a fuel tank capacity of approximately 12.8 gallons (48.5 liters). There wasn’t an “LS” model in Saturn’s 1995 lineup, so it's likely the question refers to the SL or SL1/SL2. Hope that helps! ⛽
The 2002 Saturn IAT sensor can be found on the top of the engine. The IAT sensor will be near the injector fuel pump.
S-series has two. One on the manifold and one after the CAT. 22mm is the size of the one on the manifold IIRC. A wrench will work, or a special socket set with ratchet will also work.
under the air box
Before you replace timing gear or belt check codes with code reader, may be a crankshaft position sensor. Sensor is very easy repair and L300 isn't going anywhere if that sensor is malfunctioning.
on the breather box below the air filter
Which motor do you have SOHC or DOHC?
The tube up parts needed for a 1995 Saturan SL 4 cylinder depends with your individual needs.
http://youtube.com/watch?v=AtrTcX8wym8