There are two oxygen sensors on a Nissan Sentra. This vehicle is an ultra-low emission car, thus needing only two oxygen sensors.
The are two o2 sensors in an 04 Sentra. One is called the front sensor, and it is in the engine compartment, in the exhaust manifold. The other, the rear one, is in the exhaust pipe under the car, past the catalytic converter.
2. one on the exhaust manifold under the hood, 1 on the exhaust pipe just after the catalytic converter under the car
there is 4 one is visiable to your eye when u open the hood and the rest are hiden. there is 1 on the back of the engine close to the firewall and there is 2 more on the muffler itself...
four
There is 2 oxygen sensors on the 2002 Nissen altima
The 2001 Nissan Sentra has 16 valves.
The 2005 Nissan Sentra has 16 valves.
The 2004 Nissan Sentra has 16 valves.
The 2006 Nissan Sentra has 16 valves.
The 2008 Nissan Sentra has 16 valves.
The 2002 Nissan Sentra has 16 valves.
The 2010 Nissan Sentra has 16 valves.