Purchase advice BMW 318i e46

Hello people, Would like to hear your opinions about a car and if necessary get tips whether you can access the purchase or leave your fingers off it. Go around the car from the description, TÜV New, summer, winter tires with good profile, transmission and engine flawlessly, small external defects. The car made a very clean impression, however, began to squeak in the test drive after a few minutes. At the steering stop. Had sounded as if coming I can’t really judge it from the springs, because I am layman. But the vehicle is already standing according to the dealer for 2 months. What made me stunned is that the airbag light has lit. After the test drive pointed out and from 1990 € down to 1,800 €. Incl. removal of the errors. Private sellers also turned out to be a dealer or workshop which is sold on behalf of a customer. With a resulting repair of 4-500 € I could live with the Price, I’m just not sure if there could be any more. Ask for advice. First registration 2001, 190tkm.