Hi there!
I need your help.
There is no official AC Delco dealer in my country so I had to order parts in shop which is not authorizided by AC Delco.
The shop-assistant offered me 2 oxygen sensors AC AFS75
But they didn't look the same.
One of them was an original part, I'm sure. It looked the same as in Delco catalogue.
But the other one looked suspiciously.
There was not written "AC AFS75" on it.
Everything what's written on it was:

ASSEMBLED IN USA
5360
03K16

Also there was a package with greasing in the bag with this sensor.

I'll try to add photos of both sensors below.
Please, take a look at them and say me, if the 2nd sensor is an original part or is it a fake?

THNX

 

Original I'm sure

 

What do you think about it...?

 

The AFS75 is what my oxygen sensors look like. My old ones and the ones I replaced them with looked like that. I can't tell you if the second one is a different unit or a fake, but I know it's not like what came out of my car.

 

My new ones looked like this. They changed the design. I put them in when I did my cam and they've been doing fine for over 6 months.

I still have the boxes laying around.....

 

Hm...
When I took out an old one from my car, it looked right like on the 1st picture too.

But I can't find one more sensor like on picture 1...

 

For only 6 months....

 

Trust me, you are fine to use the different sensor.

 

I'm not saying they only lasted for 6 months....I'm telling you there is nothing wrong with the new design. It will be okay for use.

 

Ok. I got it.
I thought, that somebody took out an original sensor from the box & put there a different manufacturer's sensor.
I don't want to install not Delco products

 

Thank you very much, ACE1252

 

 

Isn't the new design supposed to be an improvement over the previous design?

 

Improvement?!?!
I dont think so...
There isn't even written on the sensor that it's AC Delco product.
But it was in old design.
The are only some digits on it.(new design)
And even now I can't be sure that it's an original part.
I can put any noname sensor into the cardboard AC Delco box and sell it. And I would say, that it's an original one.
And it would be difficult to verify, if the sensor is original because nothing is written about AC Delco on it.

 

I just ordered new sensors right from a dealership and I thoguht the same thing. Both of mine look like the second one you posted with the holes (my originals had the slots in them like the first pic)