Does Maruti Suzuki Ertiga have four-wheel drive option?

No, None of the variants of Maruti Ertiga has a Four Wheel Drive option.

Note: A 4-wheel drive system provides power to all four wheels of your car, with an equal distribution between the front and rear wheels.

Variant	Price	Wheel Drive Option
LXI(O) Smart Hybrid	8.69 Lakh*	FWD
VXI(O) Smart Hybrid	9.83 Lakh*	FWD
VXI(O) CNG	10.78 Lakh*	FWD
ZXI(O) Smart Hybrid	10.93 Lakh*	FWD
VXI Smart Hybrid AT	11.23 Lakh*	FWD
ZXI+ Smart Hybrid	11.63 Lakh*	FWD
ZXI(O) CNG	11.88 Lakh*	FWD
ZXI Smart Hybrid AT	12.33 Lakh*	FWD
ZXI+ Smart Hybrid AT	13.03 Lakh*	FWD