I'm installing LT headers. So I'm replacing the 02 sensors. There's one for each Header and I'm looking but I can't remember if there were one for each converter also or just for one of them. I cut the wires in order to yank the exhaust manifolds a few weeks ago. I can't remember if there are 3 or 4 total o2 sensors. So How many? And When I bought replacement ones the ones for the headers are the 4 wire in a row connector, but the one for the converter lookes like it's a square4 wire connector but the replacement is linear not square. Hopefully I'm not confusing anyone. Any ideas here?

 

4 O2 sensors, 2 pre-cat, 2 post cat.

 

You have 4 oxygen sensors total, w/ your LT's are you going to run cats in your new y-pipe, if not you can buy o2 simulators to plug into the harness and your computer ignores the rear o2's. The harness w/ 4 connections in a row are your front o2's, the ones you need. Hope this helps.

Zach Horn

 

Ok, so the front ones are 4 in a row connectors. But what about the rear ones, the ones that plug into the cats. Those connectors look like 2top2bottom instead of 4in a row wire connectors. I'll go back to the autopart store and see if they have the right 02sensors for the rears.