I just pulled one off an 03 and put it on my 05, works great. Has the same number of wires and looks physically the same.

Is the difference in the CPU? I've seen people saying they're wideband.

 

Well it depends which sensor you replaced, it seems the second sensor, the one after the cat is the same but the one before the cat is the one that is different and is an AF sensor rather than an 02 sensor.

 

Ah, ok, it's the one that bolts into the cat.

 

yup, that is the same for all year of cars. The upstream one that mounts to the manifold/downpipe, is the one that changed in 04, and its the same part in 05. The way you tell is the newer one has 5 wires, and the older one has 4 wires. And of course, the one located downstream on the cat is always 4 wire.