I think my Sequoia is going to have to be retired. The dealer tells me it's going to need new exhaust manifolds and whatever other exhaust parts are needed during that whole process. There are 4 catalytic converters, and if only 2 need replacing, along with potential O2 sensors gone bad, the cost could go into the $4,000 range. Add to that the need for new tires, and I'm looking at $5,000. It's got 211,000 miles, the body's in great shape, as is the interior. I guess $5,000 would be about 10 months worth of car payments or so. Do I fix it, or trade it?