[CruzeDan]

So I've had mine replaced once already. Does this coverage usually mean they fixed the problem and now have a new part to replace the old one or they're just offering to keep replacing it until the special coverage ends?

It can mean either. I had mine done a few months back and the part number is the same. It is believed that they did revise the reservoir at some point late last year early this year but I cannot confirm that.
Diesel its worth a shot, but it is a long stretch due to your milage.

 

[CruzeDan]

God dammit, seriously? So the recall replaced 2 of the 3 sensors that are bad, and then this covers the DEF reservoir...so literally all that **** I went through in the summer was a waste.

Does this mean I should get a full refund for everything we paid for (O2, NOx#1, DEF Reservoir)?

The only thing not covered, that we "paid" for was the NOx#2 sensor, and they just cleared the code instead of replacing it.

You should be eligible for reimbursement for the NOX 1 and the reservoir (as long as your car was in the mileage range covered at time of replacement.) The HO2S is a stretch.