Don't take chances, buy it once, install it once.

 

You wouldn't think it would matter on drum brakes. I was thinking about ABS but you don't have that right? I would call the dealership and ask them for the part numbers for your vehicle. They sell Denso so you can compare......good luck.

 

Yah I'm not 100% sure about ABS on my vehicle tbh...I'll do that, thanks

 

The up stream sensor (Bank 1 sensor 1) and down stream sensor (Bank 1 sensor 2) is a different sensor. The up stream one is a air fuel sensor and is much more complex that is why it usually cost more. With that said you can also search for the same sensor on amazon, autozone and oem toyota parts site to ensure that you are getting the correct sensor for your car.

 

Oh, I get that they're different sensors, my issue is getting say an upstream sensor that specifies awd for rear drum disc brakes for example and would that matter if I bought one of those for my fwd rear drums.

 

Don't buy from Amazon or eBay unless you want a potential counterfeit.

 

I'll say it again. Don't take chances, buy it once, install it once. If you want to want to know the answer, you have to find out yourself. Take a chance, buy both of them, potentially install it twice, return the unneeded sensor.

 

fair enough. Thank you)