To estimate the price of the 2019 Hyundai Elantra I4 1.6L Smart (Base) with 131000 km mileage, I first looked at the selling prices of similar cars. The closest match is a 2017 Hyundai Elantra I4 1.6L Smart (Base) with 203000 km sold for 29000 SAR on 2024-06-25. Adjusting for the year difference and lower mileage, the price should be higher. The 2019 Hyundai Elantra I4 2.0L GL (Mid) with 128388 km sold for 46000 SAR on 2024-08-15, but this is a higher trim and engine size. Considering the lower trim and engine size of the target car, the price should be lower. The listed prices for similar 2019 Hyundai Elantra I4 1.6L Smart (Base) range from 39000 to 46000 SAR. Given the average condition and mileage, I estimate the market price to be closer to the lower end of this range.