I test drove a car listed on Ebay. The steering wheel wobbled, I heard a slight squeal when coasting at slow?

speed, and the check engine light came on and stayed on the last 2 miles of the route I took. The seller explained the wobbling was probably from a tire rim that had been bent (and hammered out) and the squeal was probably from the brakes since the vehicle had been sitting (I wasn't applying the breaks when I heard the squeal). I suggested that he take the car to the nearest AutoZone and have them diagnose the check engine light with their computer (which I believe they will do for free). The seller called me back the same afternoon and said that he took the car to his brother-in-laws and added power steering fluid and transmission fluid, and doing this made the check engine light go off and stay off. The vehicle history report shows the vehicle was involved in a front-end collision 4 years ago, resulting in mild-to-moderate damage. The only damage he claims was from the accident is moderate paint chipping on front bumper. Should I trust all that he is telling me, or walk away?