To estimate the price of the 2015 Nissan Sentra I4 1.6L S (Base) with 156650 km mileage, I first considered the selling prices of similar cars. A 2015 Sentra 1.6L SV (Mid) with 149023 km sold for AED 15500 on 2024-11-03, and a 2015 Sentra 1.6L S (Base) with 240584 km sold for AED 14000 on 2024-09-17. The car in question has a lower mileage than the latter but higher than the former, suggesting a price slightly above AED 14000. An offer of AED 17500 was accepted for a similar 2015 Sentra 1.6L S (Base) with 158000 km on 2023-10-14, indicating a potential upper range. Considering these data points, the estimated market price is likely between AED 14000 and AED 17500. I also noted a listed price of AED 18000 for a similar car with lower mileage, which supports a slightly lower estimate. Thus, I estimate the market price to be around AED 15000.