It never fails. We come to Pennsylvania for Christmas and there’s something wrong with my mother-in-law’s car. Yesterday I went on an errand for her only to find the check engine light in full bloom. I stopped at Kost(they do repairs and oil/lube etc. in addition to tires), they ran the diagnostics, and found it was an oxygen sensor. Who knew? Within about ½ hour, I had to stop playing Angry Birds because the car was already finished. The staff was competent, friendly, and did the job quickly. What next?