Both. There is a sensor in the manifold before the CAT and after the cat under the car
A lot of places actually. Personally, I recommend NATE - North American technician excellence. They have awesome technicians, fast and for a low cost.
All oxygen sensors are located in the exhaust either before or after the catalytic converter.
There is two oxygen sensors. One is located before the catalytic converter is located under the heat sheld. The oxygen sensor after the catalytic converter is found under the catalytic converter (under the car) before the catalytic transfer pipe.
There will be one before and one after the catalytic converter.
The V6 Saturn typically came equipped with 3 oxygen sensors; one on each exhaust manifold and one after the catalytic converter. The one after the catalytic converter does not typically fail.
There are two oxygen sensors, there is one located in the exhaust system before the catalytic converter and one after the catalytic converter.
They are threaded into the exhaust system, one before the catalytic converter and one after the catalytic converter.
For the 2.2 liter, there are two. One is a pre catalytic converter sensor, and the other is post catalytic converter. They are very easy to access and replace.
behind the catalytic converter
There are four oxygen sensors on a 430. One before the catalytic converter and one after the catalytic converter on both left and right exhausts.
2, one before the catalytic converter and another after the catalytic converter.
It is screwed into the exhaust pipe just before the catalytic converter.It is screwed into the exhaust pipe just before the catalytic converter.
Two, one before and one after the catalytic converter.Two, one before and one after the catalytic converter.