As a follow up to my previous post, what has been everyone's experience with O2 sensors? I have seen several comments saying always buy Bosch, with some chipping in that they have had good experience with Walker as well. Everyone soundly agrees to not buy cheap foreign made sensors. What has been the specific experience after purchasing a cheap foreign made one? Did it stop working after a short period of time? Did it just not work from the get-go? I made the choice (mistake? after reading several comments) to buy a cheaper alternative sensor (Drivewire brand) which didn't fix my issue.

 

Having just gone through this I ordered both front and back from a well known LR parts house. They were Walkers. The two fronts did not work - instantly threw codes. One never worked, the other worked intermittently. Decided to get OEM Bosch replacements for the front two. Worked like a charm. As always YMMV, but my rig definitely only wanted Bosch. Of course, I could have gotten a bunk batch, but if I were you I'd save yourself my headache and just get Bosch.

 

Bosch that were on it when I bought it started throwing codes, replaced with Bosch threw same codes, replaced with walkers still threw same codes, replacing the Cats now.

 

I've only used Walker replacements on two different trucks, and also on my wife's car, with excellent results. I can't give any comparison data since I've never used anything else.

 

Walkers here.

 

Thanks everyone for the input. I was hoping to order some replacements to fix an issue with my Bank 2 sensor 1 but I determined that it's actually not the sensor after all after switching sensors with the working side of the vehicle.
now I'm not sure what the deal is... Since it's not the sensor I stripped back the protective corrugated cover on the ECM side wires and found that the signal and signal ground wires (blue and red correct?) join into a cable. It looks like someone did some work at some point because there was a heat shrink piece where the cable insulation ended, and there was also a bare stranded wire that just ended under the heat shrink.. any idea what that wire is for? It doesn't connect to anything on the sensor side currently and I don't see it on the circuit diagram. I would think ground wire but there is already a signal ground wire...

 

For me… Bosch for all other parts EXCEPT O2 sensors. NTK FTW!!!
Part #25623 UP & #25624 DOWN.

 

Interesting - thanks!