SOURCE: check engine light
B1S1 O2 sensor is threaded into your exhaust manifold, closest to the actual engine in the exhaust stream.
SOURCE: How to locate the oxygen sensor in a LEXUS LS430 (Bank1 Sensor1)
the O2 sensor for bank one sensor one is located between the catalytic converter and the engine in the exhaust head pipe. see photo of your engine cylinder layout, the sensor u want to replace is the one at the cylinder #1 
bank on right.
SOURCE: Can't find the bank 1 sensor 1 Oxygen Sensor
bank one in a C280 99 sport its located on passanger side where 1st cylinder its located, When you step front of you car, take out the plastic cover and see right on top of the front spark plugs, you will see numer 1 on you left side (diver side) 1st top of 1st spark plug you'll see number 4 on you right side same first spark plug from your right.
In you want to replace bank 1 1-2 or 1bank-2nd sensor. you'll need to remove exhaust pipes about 6 bolts total in you garage your car well lifted and a 12pack of beer one friend of you may take about 3 hrs be patiente.. beers are for after job done!!
Good luck..
Durango, mexico
SOURCE: Picture of bank1 sensor1 o2 sensor location on
I do not have a diagram but, bank 1 is the bank where #1 cylinder is at. other side would be bank #2. so bank #1 o2 sensor is just before convertor.
SOURCE: My 96 Chevy Blazer 4X4 failed echeck, due to
It is a good idea if replacing one 02 Sensor to replace all of them at the same time. Location is- they screw into the exhaust pipes below the exhaust manifolds and before the muffler.( Very hard to miss them ). Make sure you have the codes cleared from the on board computers memory after repairs are finished. Good Luck and have a good XMASS,
bank on right.
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