Bank 1 o2 sensor 1999 honda accord lx v6, i need the location to change it. i can not find it in the front of my car

THE CAR NEEDS SERVICE, GET SOME?
no country of VIN told , no engine told. guess at V6 I will, 3.3L
that o2 heater is dead. or the 4wires to the oxy sensor are burned up on the exh. pipe. toss coin or better just look at it.
sensor #2 is behind the CAT. and is bad.
you posted no engine told at all, and is a 100% engine question.
S1 is always front of CAT, S2 is rear.
upstream or down stream, (S1 /S2 order)
B1 bank 1 means that bank that has cylinder #1 there.
on the 4 banger #1 is front of engine a belt drive end.
on a V6 , the #1 cylinder is most front (it's off set to bank2)
3.3L back bank row is B1. (drivers end)
so bank1 s2 is that exhaust manifold rear that goes to cat #1 and the rear of cat 1 is B1, sensor S2 rear of cat.
the heater circuit side never lies,it means the voltage or current flow to that heater is dead wrong. open/ or shorted heater or its wires to it.

the gen 3 car? 2014
engine line up is here.
Petrol:
2.0 L Theta II T-GDi I4
2.4 L Theta II MPi I4
2.4 L Theta II GDi I4
3.3 L Lambda II MPi V6
3.3 L Lambda II GDi V6
3.5 L Lambda II MPi V6
Diesel:
2.0 L R II CRDi I4
2.2 L R II CRDi I4

keep in mind my answers are USA only
and USA EPA. DICTATES CAT LAY OUT AND DESIGNS.
SOME CARS RUN Y PIPE TO A SINGLE CAT. V6
WHAT YOU HAVE THERE , IVE NOT 1 CLUE.

Usually these are located on the exhaust manifold or just below the exhaust manifold and you should be able to see it in the engine bay. On V6 engines there will be one sensor on each of the 2 exhaust banks.
You will probably need to remove the engine cover to see the sensors on your exhaust.

If someone told you to replace these because you got a particular fault code I would be wary. A decent scan tool and basic diagnostics can show if the 02 sensor is working or not. Some faults often blamed on an 02 sensor are not due to faulty sensors.

locate your cat converter on your exhaust system and behind it going towards back of car u will see a wire connection going into the exhaust system tube thats ur o2 sensor

If this is a V6 bank 2 sensor is the one before the catalytic converter in the bank of cylinders that contains cylinders 2,4 and 6.

Saying 'bank 2' implies you have a V6 engine-bank 2 is the side that does not have #1 cylinder. Because you have a newer OBDII system, though, you have 2 sensors on each 'side'-before the catalytic converter and after, referred to as 'side 1' or 'side 2.- So your bank 2 sensor(2) are either before he cat or after, which one did he say you needed? Usually the Side 1 sensor needs to be replaced since it is the one that the engine computer uses to modify settings on that side of he engine-side 2 O2 sensor merely monitors the catalytic converter effenciency. If you determine where your second 'bank' is, and follow the exhaust out of the engine compartment to the catalytic converter, the O2 sensor is located there in that small space.

Bank 1 refers to which side the O2 sensor is on and Bank 2 refers to the actual sensor. Bank one is always on which ever side cyclinder #1 is on. In your case it will be on the back side towards the fire wall, and will be the O2 sensor that is past the catalylic converter (otherwise none as a downstream O2 sensor).

1--2--3
======
4--5--6
Front of car

is it a 4 cylender, or 6. if its a 4 cylender the bank 1 sensor 2 is the sensor closest to the cadalatic converter, on the exhaust. if its a 6 cylender you will need to contact honda, and see which bank is one, and which bank is 2... The banks refer to the side of the engine they are talking about. a v6 will have 2 banks, drivers bank and passengers bank, sensor 1 is always the sensor on the exhaust closest to the engine, sometimes even on the manifold, and sensor 2 is the one slosest to the cadalatic converter.. hope this helps, o2 sensor explaining can be a little difficult

Look at both cylinder heads the one closes to the front of the motor is bank one, the location of sensor two will be the one after the Catalytic converter,Hope this was very helpful.

http://www.honda-tech.com/showthread.php?t=2385730 good luck!

Should be in the manifold on the back side closest to the firewall.