Two different sized O2 sensors??

[Tkicker182]

My car failed emissions by .1 hydrocarbons and the pressure test. Pulled codes and only got a 91. Went under to check the O2s and the driverside one looks normal while the other is tiny! Like as thin as a pencil and maybe 2 inches long. And code 91 means the normal looking one is malfunctioning (i think). So what is the deal with the different sizes and any suggestions on passing emissions? On a side note...does anyone know what line they crimp off during the pressure test...it is something off the charcoal canister. Thanks guys.

 

[RacEoHolic330]

The size difference might just be different brand o2 sensors

 

[Tkicker182]

I suppose that would be a nice logical answer. I was told that the small one is the factory piece. I guess I have only seen a bosch sensor. Does anyone know if the ones from Ford are really small?

 

[TheUser]

i recently pulled mine out of my stock LX and they looked like the normal O2's that I've seen.

If you have an extra $80-90, you might just replace both of them.