Are they any good i can get the 2 upstream from Advance for like $55.00 They have a 35% coupon online. Or spend over $100 on the motorcraft ones. I have 144,000 miles on mine i think its time to change them. I am fighting a shake at idle in park

 

O2 sensors won't fix that.

 

I went with the Motorcraft DY835 from Amazon for $52.06 each. I read that the Motorcrafts were more "sensitive" than other brands and sent more updates to the computer. I'm pleased with how my 5.4 is running with them.

 

Bosch are oem...
But like projectsho89 said, unless the pcm is picking up a fault in an 02, there is nothing wrong with them. Even so, they would not cause a rough idle.

 

I was thinking about changing them just because the age and milage on them

 

I have to take exception with this statement from my experience. OP is obviously looking for smoothest running engine possible as I was. I had no codes showing so technically the system was within parameters, but changing the 2 sensors led to much smoother idle quality, better throttle response and improved gas mileage for me. The Motorcraft brand sensors seem to be the choice ones to use to get the best results from what I've read. Mechanics I've talked to recommend changing them as early as 60k also.

 

Rock auto carrys Motorcraft cheap.. While the O2 isnt going to fix the rough idle most likely replacing them will improve performance a bit.. Engine probably needs a full on tune up..