I want to replace my upper o2 sensors in my 99 contour 2.5L. After doing a search I found that most people use bosch part #13115 for the uppers and part #13133 for the lowers. But the parts store had bosch part #13741 listed for the uppers. I also searched at
www.boschusa.com and found that they also have part #13741 listed for the upper o2.
Has anyone else encountered this? I wonder if they replaced the 13115's with an updated part. Would like to here suggestions and opinions please.
THANKS.