I got code 0409 on my car the other day. It comes up with "unidentified" but a little research has shown it to be the rear bank oxygen sensor, my question is, does anyone know what the part # is for that oxygen sensor? I dont think upstream front and rear are the same are they? Any help is much appreciated....

 

The only difference is the length of the wire.....dont get em at a dealer...they wont use vaseline!...the fronts are 3 wire...after the cat i they r 4 wire....

try ebay, i got a ntk for 22 bucks sipped last week

 

I usually go to sparkplugs.com or www.ngk.com to get the part number for NTK and base price. Once I have the part number for an NTK, then I search around for the best deal. Do you need to replace the sensor this weekend or can you wait a week?

The best deals are from internet sellers (e.g. eBay) where you need to wait for delivery. If you cannot wait, I would check with advanceauto.com or autozone.com for the best deal. You can use discount code TRT30 or TRT41 (depending on order size) at Advanceauto.com if you cannot wait for delivery.

 

Now is $22 bucks just for the sensor without the end plugs? Like would I have to solder them onto the existing plug?
Ill definitly check them out, cuz I can wait.... Thanks for the info guys....