Do Auto (CVT) Hx Civics have Lean Burn?

[Dgreen78]

Just picked up a Civic for commuting and was surprised to find a 4-wire primary 02 sensor. I was under the impression all the HX models have a 5-wire but I was wrong. So questions is, do the Automatic Hx models have lean burn function? Is it even possible with a regular 02 sensor?