Found an '04 Cooper S with 190K mileage thats for sale. Owner says runs great but throwing a code for O2 sensor which from reading the forum could mean a lot of things. Had sat over the winter so needs rotors surfaced and hoping O2 is just bad gas. It's a 3 hour drive to pick it up but it's under 2k for price. I see a lot of high mile R53's on here so I'm thinking of jumping on it for an extra car. I'm not afraid of wrenching on it but I'm new to MINI's coming from the Jeep world. Is this biting off too much to start?