how many 02 sensors does a 01 monte have?i been getting bad mpg's and figure that could be one culprit,going to the zone soon so they can diagnostics it

 

I know at least 2. How many miles? Plugged fuel filter, plug wires/plugs, PCV Valve, (although that wouldn't really mess with mileage) How new is your air filter, are your tires inflated to the proper PSI? Those are just some ideas other than O2 sensors that would cause bad mileage. Is your car an SS or LS?

 

ss,yeah i need to check all those to especially fuel filter

 

At least 2 I know for sure...possibly 3....the two by the catalytic converter and possibly one of the rear exhaust manifold? I'm NOT sure thought.

 

i know the one by the cat but figured im getting bad mpg's and it was a 02 sensor how could it do that being all the way by the cat.the 02 sensor on the exaust manifold does make sense to me.i guess i'll have to ask around.thanks

 

The '02 has 2, one before the cat and one after. If I could find my Haynes manual I could tell you, but since it also covers '01, I'd think it'd bethe same.

 

thanks!

 

There are 2. One is on the rear exhast manifold directly below the flat part of the firewall.This one measures for air/fuel mixture. The second is about 6 inches behind the cat and makes sure the emissions are good.