It lists an upstream bank 1 and bank 2 as 2 different part numbers. Cant for the life of me think why they would be different unless the wire length on one is a little longer than the other. Reason I ask is I have one on the shelf new in the box, but its for the opposite side as the trouble code indicates.

15717 Left up-stream sensor (located before catalytic converter)
15719 Right up-stream sensor (located before catalytic converter)

autozone also lists the 15719 as fitting for the downstream "Down-stream sensor (located after catalytic converter)"


(thanks again rockledge for the great pic)

 

The upstream O2 sensor P/N varies due to lead length. We should replace with OEM, or a like design & Both sensors should be changed at the same time, so that sensor response range & speed keeps both cyl banks fuel trim balanced. EDIT: Informative O2 sensor TSB info https://www.ford-trucks.com/tsb/full...hp?tsb=*01-9-7 O2 sensor mini tutorial http://www.aa1car.com/library/o2sensor.htm

 

Thanks for the info. IIRC the last time I replaced them I had so much extra lead that I had to zip tie it together to keep it from being all over the place on both sides. Like an extra 6 inches. But its been awhile. So if the net effect of the difference is just length of the wire then that at least gets me some use out of this one and some testing.

Thanks!!!!

edit, I see I missed posting it, but I had a O2 sensor code 0153 pop up yesterday.

 

OK, good edit feedback. The P0153 is for the bank-2/drivers side, upstream O2 sensor response being slow, so that O2 sensor is old & lazy, sorta like me. It should be replaced along with the bank-1/passenger side up stream O2 sensor, so that the sensors response time & range are in spec & balanced & can keep Both cyl banks fuel trim in good control. This could help with mpg, cold starts & maybe driveability problems & the bank-2 cat converter would likely appreciate it too.

I ordered online with in store pick-up to save shipping & a 40% off discount code from Advance Auto & bought the specified Bosch replacement O2 sensors for both cyl banks on my 94 Taurus 3.8L, about 5 years ago when the bank-2 sensor got slow. Both had different, but the Correct lead length that matched the OEM sensors being replaced (no extra lead length to have to tie up), correct lead configuration, electrical connector & anti-sieze already applied to the threads. I used a little more high temp nickel loaded Permatex anti-sieze to the threads, being careful not to get any on the O2 sensor tip & contaminate it. All has been well since & the last two tanks of gas turned in 24mpg in mixed urban driving, not bad for a 21 year old 3.8L Bull!!!! lol

 

I have used bosch too, so maybe our mileage may be varying (instead of YMMV)!

As you may remember I have been chasing problems with this truck. Any idea if an O2 sensor will do bad things before it starts throwing codes?