I know there are at least two, one on each pipe coming off the exhaust manifold. One web site indicated that there might be one more?

Is it just two, or is there another?

Thanks,
LT


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'97 F-150 EC 4x4, 4.6L

 

Most likely 2, but the best thing is to get under the truck and look.

 

In 96 It became nation wide that all cars in the US be equiped with an OBDII computer system. an extremely **** emissions monitering system. Which in all OBDII systems there is suppose to be a pre cat O2 sensor(The ones comming off the manifolds) and a post cat sensor somewhere after one of the cats. So I would say there is Three O2 sensors.