where is the oxygen sensor

The oxygen sensor is in the exhaust pipe near the catalytic converter. I dont know what you mean by 'before the car'. Please give more information if this is not what you were looking for.

The oxygen sensor for your car is in the exhaust manifold (could be under a heat shield). It will be located prior to the Catalytic Converter.

Exhust manifold

your vehicle may have43 sensors, located in ehaust code may be bank1 sensor 1 or bank 2 sensor 1, bank 1 sensor 2 or bank 2 sensor 2, number 1 o2 sensor are located at exhaust manifolds snor 2 located downstream in exhaust, hopes this helps, need to pull code and see which sensor getting trouble

sorry, a meant may have 4 oxygen sensors not 43,hit both numbers at same time

Where is all the sensor on a 1998 Honda accord LX four-door