I’ve got the cold start squeaks coming from the grooved lower idler pulley. It’s definitely wobbling a bit so I was going to replace it. Marked with the green arrow below.





I’ve found two different part #’s for it but I have no idea which one it is:
1L2Z-6C348-AA
OR
6L3Z-6C348-A
Does anyone know what the difference is between these two?

 

Take it off the car and drive it to the parts shop. It's the easiest way. They can look at the bearing and make sure the get the correct back spacing, width and diameter. Might as weel see if there is matching pulley and replace it too. I've broken pullies before and it stranded me.

 

the 6L is a 2007; that will fit fine.
When you change it, do NOT overtighten the bolt. torque spec is 18 ft-lbs.

 

Thanks for the replies. The dealership confirmed the 6L3Z-6C348-A is the one I am after. I'm not sure what the story is with the other part #.
I decided to replace the smooth idlers including the tensioner pulley and the bolts while I am at it. That's probably totally unnecessary, but I tend to be overly thorough with my car.
Does anyone know if I should be using Loctite on the pulley bolts?