I get test codes 172 & 176. I know these codes are for the Oxygen sensor. The question I have is, how many O2 sensors are on my 5.8 engine? While looking under the truck I only found one! Are there a couple of more up by the manifolds?

 

I thought there were 2? One on the exhaust just past where it bolts to the manifold and one on a skinny tube that connects just before the cat.

 

Should just be the one in the y pipe crossover tube.

 

OK, thanks! I'll replace the oxygen sensor with the Motorcraft brand and see if this will eliminate the code