Most 4.0L engines with federal emissions have two oxygen sensors located on the exhaust pipe before the muffler. One sensor is mounted before the catalyst (upstream) and one is mounted after the catalyst (downstream). Most 4.0L engines with California emissions have four oxygen sensors. These are mounted in the exhaust manifold area. Two are upstream and two are downstream. There is an emissions label under the hood of the vehicle that identifies the emissions type.
4
The Patriot has two oxygen sensors. One before and one after the catalytic converter.
4
A 2007 Durango has four oxygen sensors.
There are two.
Only ones that have failed.
It has 4 total.
There are two o2 sensors on this car.
Two, one before the cat and one after.
2
how many oxgen sensors on a 1995 millenia
It depends on number of cylinders the engine has. 4 cylinder engine has 2 oxygen sensors. V6 has at least 3.