Q4 e-tron Sportback; w/R1234yf Refrigerant. Q4 e-tron Sportback; w/R744 Refrigerant. Q4 e-tron; AWD; w/R1234yf Refrigerant. Q4 e-tron; AWD; w/R744 Refrigerant. Q4 e-tron; rwd; W/R1234YF Refrigerant; From 04/19/2021. Q4 e-tron; rwd; W/R1234YF Refrigerant; To 04/19/2021. Q4 e-tron; rwd; W/R744 Refrigerant; From 04/19/2021. Q4 e-tron; rwd; W/R744 Refrigerant; To 04/19/2021.