Ask him about what electrical problems it had that he fixed and what electrical problems it has that he didn't fix yet. If he says it never had any then he is LYING. Make sure all the windows and seats move. Ask him if the digits ever disappear on the climate control display. The problems are not major but they exist.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra