well it looks tidy and well looked after, i would be asking the lowest they would go first, if the paint is original and thats all the rust it would prbo be a good buy. the engine bay being dirty dont worry about it as for the sensor they are cheap or free just ask some of the guys on the forum. if it where me at 3k i would buy it, it is mostly original, paint is original so you wont find many hidden nasties and to top it all off it has the awsome 280zx interior blue and light grey just like mine not the horrible red. hope this helps. if you want some more advice just give me a call on.
( zero, four, two, three, six, seven, nine, eight, seven, seven )
cheers pauly