5.0nly

Where exactly is this sensor? Can one change it out at home or is it better off to have a mechanic do it?

alberta46

If you are talking 02 sensor I believe bank 1 is drivers side sensor before the cat. You can do it yourself but the sensor can be hard to get out.

TJPlatinumEB

If one of those front sensors goes out, the other isn't far behind. Do yourself a favor and replace both of them. They are wideband sensors and are much more sensitive than a standard one. Sensor 1 is always pre-cat sensor. When it comes to O2's, I always just replace both sides to ensure they both are working well.

05 super

Bank 1 is same side as cylinder 1 i think..i have to replace bank 1 sensor 1 on my Eco..passenger side upstream one.

5.0nly

ces04

on both sides, sensor 1 is accessible through the wheel well towards the cab after the headers, sensor 2 is near the transmission bell housing under the truck and pokes through aluminum heat shielding on top of the second CAT on each side (2001 F-150 4.6L V8)

white08gt

have to have O2 sensor tool and they hard to break loose. Harbor Freight has a cheap one. I bought a Bosch replacement from Rock Auto, seems some on here don't like them. Mine work fine for 35k miles and then sold the truck, so don't know how long it would last.

Daniel58

the location of bank 2 sensor 1 on a 2017 F150 3.5 ecoboost

dsg2003mach1

wrong subforum but its all the same

Ford stuff:
bank 1 - passenger side (cylinder 1 starts at the passenger side closest to the radiator, #3 would be at the fire wall)
bank 2 - driver side (closest to radiator being #4)

Sensor 1 - pre cat - the wideband sensor
Sensor 2 - cat monitor/rear sensor

Barry_Vee

Bosch is OEM on my 2011. They recommend changing their O2 sensors at 100K. Brought mine from Rock Auto too.

Driver side B1S2 has better access than passenger. I removed the inner fender for B1S1.

Mine were hard to break loose. Start the engine after application of perpetrating oil to add heat and let it sit awhile to help break free.

If you don’t own an O2 socket get one.