Used 2002 Audi Quattro A4 (3 0 V6) for sale in Boise, ID

All wheel drive Audi with tiptronic shifter. 140k miles. I've owned it for about 4 months, got it from the auto auction. Thought I got a good deal then the check engine light turned on and the codes are a bunch of sensors going bad, now the engine has developed a knock. In the time I've had it I've changed the right headlight and ballast ($700) and got an oil change. I have now realized that I no longer have money to put in this car, and I also need money for living expenses. There is a tear on the driver's seat but overall for a 19 year old Audi I would say that this one has been well taken care of. Price is negotiable, would be a good deal for a mechanic.