To estimate the price of the 2021 Audi A4 40 TFSI S-Line I4 2.0L Turbocharged 30 TFSI Sport (Top) with 156000 km mileage, I considered the listed prices of similar cars. The closest match is a 2021 Audi A4 40 TFSI S-Line with the same variant and mileage listed for SAR 53000. Other 2021 models with lower mileage (24000 km) are listed for SAR 147500, and 2020 models with mileage around 57000 km are listed between SAR 127000 and SAR 135000. Given the high mileage of the target car, its value would be significantly lower. The 2021 model with 156000 km is the most relevant, and its listed price of SAR 53000 is a reasonable estimate, considering the condition and mileage.