NEW o2 SENSORS OR NOT?
 

I am putting a catted xpipe on this weekend and was wondering if I should replace the forward o2 sensors while I have everything down.The car is a 99 GT with 70k. Opinions please. Also is there any difference between the Bosch sensors and the ford/bosch sensors.The Bosch say they are OE and are half the price.

yes there IS a difference, even if Bosch makes the same one for Ford, as FoMoCo calls for tighter specs than what Bosch sells to the so-called "parts stores" and the ECM in our cars is sensitive enought to read the difference between them and at 70k, your O2's are pretty-much all used up....so bottome line is: replace them and replace them wth oem Ford o2'S

it couldn't hurt to replace them.

Randy what do you charge for a front set out of curiosity.

Thanks for the replies, I've got set of new ford sensors on the way.The weather was kinda crappy this weekend anyway.

depending on the year, anywhere form $59.95 to $69.95 eacg

Randy, how long do these things usually last? I have a 2000 with 75k....still original set on a blower car.

usally @70 to 80k there just about used up

You're lucky, mine went at 60k. However, my dad has driven his trucks to 200k w/ no need of new sensors so it really depends, on a lot of things. However, the best indication that you need new ones is when you notice your gas mileage/performance dropping or if the SES has a code for the O2's.

hey I dont know if this is a dumb question but it kinda relates to this topic
but i put in new Headers and while removing the H-pipe i broke a up-stream o2 sensor
and im getting a new o/r x-pipe with MIL eliminators, can i take one of my old down-stream o2 sensors and put it up front?

Nope, they're different sensors. Up front you have the green ones while downstream you have purple and/or blue.

I used the bosch from AZ and went on a trip to fl the next day (this was last week) and i got 29MPG out of my GT.

OK thanks i was just currious