In the exhaust pipe directly under the passenger front seat...
Pass side, after the converter.
5w30
The 2003 Lexus IS300 uses a 2JZ-GE inline-6 Toyota engine, and has 6 ignition coils (coil on plug).
it is vehicle stability control
5.7 quarts
18 city 22 hwy
it is located between the radiator hose going into the water-pump housing.
Standing in front of the car looking at the engine Bank 2 is the 3 cylinders closest to the front of the car. The sensor is located on that bank of cylinders exhaust manifold.
this is for the 01 model. it might also be the same for the 03, http://www.porkfist.com/repairs/auto/lexus-is300-taillight.html
its connected to Muffler & Exhaust
2003 Lexus IS300 tail light bulb replacement: Purchase the correct replacement tail light bulb(s) first, before disassembling the vehicle. See sources and related links below for replacement bulb information. Then consult your owner's manual for the tail light bulb replacement procedure. As simple as it sounds, the owner's manual is the best place to start for bulb replacement instructions and illustrations. You may want to consider replacing both left and right at the same time in order to keep brightness and color equal (optional).
There are 4. Two upstream (bank1) two downstream (bank2).