Replace Rack & Pinion or Buy new Car?

Have a second mechanic (Ideally not a chain or dealer shop) check out the car and see if they see the same problem and see how much it would cost.

“Turn-up” is not a standard thing these days. it could mean almost anything. Who did the maintenance (dealer, local independent mechanic, yourself???)

If it was a quick lube place, well… you should start over.