O2 sensor question

Hello,
I have a 91 3800 Vin "L" V6. How many oxygen sensors are in my vehicle? I am trying to budget a tune up and I can't find a resource with this info.
Thanks in advance.

It should have two. One in front of the cat on the exhaust manifold or down pipe and one behind the cat. If you don't have a light and the fuel mileage is good I wouldn't change them unless they are original to the car. Plugs, wires, air filter, fuel filter and pcv should be all you need to tune up the car.

Hello,
I have a 91 3800 Vin "L" V6. How many oxygen sensors are in my vehicle? I am trying to budget a tune up and I can't find a resource with this info.
Thanks in advance.

It should only have one O2 sensor located in the rear exhaust manifold. IIRC they didn't start using two O2 sensors until 1993 on CA emissions equipped Regals. 1994 and up use two; one in the rear exhaust manifold and another located downstream of the catalytic converter.