Hi, has anyone replaced an upstream o2 sensor?! I want to do the work myself, just wondering how difficult it is and could use some advice! THX!

 

yea just did both upstream and found out that the aftermarket sensors for my 04 were junk (bosch) had to buy ac delcoes and switch them out with the boschs. had them in for a month now and codes haven't come back. P.S. If you don't have the o2 sockets, I would recommend borrowing some, saves the headaches haha but good luck laneytay!

 

o2 socket and a breaker bar or a 7/8" box end wrech doubled up and maybe a little propane torch and pb blaster. pretty easy job tho, like "yaxta" said get ac delco o2 sensors.