There are 2 oxygen sensors on an 04 frontier pickup 2.4litre. One is located after the catalytic converter (on the exhaust Pipe) and the other is between the exhaust manifold and the catalytic converter.
All O2 sensors are threaded into the exhaust system at various points.
There are two oxygen sensors on a Nissan Sentra. This vehicle is an ultra-low emission car, thus needing only two oxygen sensors.
Just one and its located right in the middle of the front of the motor.
The upstream oxygen sensor is located in the exhaust pipe between the exhaust manifold and the catalytic converter The downstream oxygen sensor is located at the catalytic converter outlet
AnswerMy 1999 Frontier actually has two oxygen sensors. One in front of the catalytic converter "upstream" and one after "downstream" which constitutes double the cost.The best thing to do is find out which one is bad before you replace them.P.S. the catalitic converter is inline with the exhaust system.Additionally, You can get the Entire "2000 Nissan Frontier" Official Service / Repair Manual for less than 10 bucks.
The oxygen sensors are located in the exhaust pipes.
There is 2 oxygen sensors on the 2002 Nissen altima
four
oxygen sensors are located just forward of your engine. In front of the engine is the catalytic converter. At the top at the bottom are your oxygen sensors.
there are two located on the y pipe prior too the pre cats and one more in the rear converter
the part no. are 64,2387,79856
one is in the exhaust manifold, one goes into converter