does anyone know the difference between the downstream o2 sensor and the upstream one when i got my car it only had two on there and well i went to the auto part store and ther showing two different ones and there it a twenty dollar difference witch one should i get?
upstream downstream?
- Thread starter 95SLOW5.0
- Start date
OnyxCobra
Post Whore
our cars don't use a downstream one, just a pair of them before the cats.
AaRoN
King Post Whore
Upstream is before the cats and the downstream means that they are either; on the cats or after.
2slo95fiveoh
Well-Known Member
Upstream sensors are before the cat (as already mentioned) but they also have a heating element in the sensor,
making them a little bit more expensive than downstream sensors (not equiped on 94-95 5.0). If a car has only 1
sensor per bank of cylinders, they're usually upstream sensors. Auto Parts stores will carry a listing for downstream
sensors on 94-95 5.0s, but your local Ford dealership won't. And X2 on buying OEM ford O2 sensors.. mine lasted until
115K when one started crapping out, so i replaced them as a pair.
making them a little bit more expensive than downstream sensors (not equiped on 94-95 5.0). If a car has only 1
sensor per bank of cylinders, they're usually upstream sensors. Auto Parts stores will carry a listing for downstream
sensors on 94-95 5.0s, but your local Ford dealership won't. And X2 on buying OEM ford O2 sensors.. mine lasted until
115K when one started crapping out, so i replaced them as a pair.
