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Was that way for 2012 as well - and likely earlier.
The PZEV-spec engine meets Federal Tier 2, Bin 5 emissions requirements and PZEV requirements in California, Massachusetts, New York, Maine, Vermont, Connecticut, Pennsylvania, Rhode Island, New Jersey, Oregon and Washington. It also meets Euro IV emissions requirements.
The non-PZEV spec is for all the other states, presumably.
The PZEV-spec engine meets Federal Tier 2, Bin 5 emissions requirements and PZEV requirements in California, Massachusetts, New York, Maine, Vermont, Connecticut, Pennsylvania, Rhode Island, New Jersey, Oregon and Washington. It also meets Euro IV emissions requirements.
The non-PZEV spec is for all the other states, presumably.