I finally replaced my a/c compressor and recall fuel rails on my 96 SLS when the local temps went above 90 degrees F. My local Pontiac dealer gave me one of the best of all quotes; the highest being the Cadillac dealer and they don`t replace the accumulator - said they found that they really don`t need to. The Pontiac dealer did it for $1113.17 total with new accumulator, orfice, etc. Back in December they said a pre-cat Q2 sensor was bad and estimated $250 to replace it. This time I asked them to verify that the O2 sensor was bad when they did the work a/c and give me a new qoute if it was bad. The NEW service manager phoned me that the sensor was not bad and I happily picked up my car. About a mile down the street the Service Engine Soon light came on. I immediately went back to the shop and the service manager had the O2 sensor checked again. He came into the waiting room looking a little upset and told me the sensor was bad, that the mechanic had made a mistake. Then the Big Suprise! Are you ready for this? He told me that this should have never happened, and that he would put me in a new sensor FREE, that it wouldn`t cost me anything. When done, he gave me the new sensor bag with the bad sensor in it. After all work was done, I found two plug wires not "snapped" fully in place. They checked the back four again - were OK. The left rubber hood stabilizing "bumper" was missing off top of the stud, and they put on a new one. So in the end it cost me $1113.17 total for everything. Now it`s running like a top with no codes or warnings or leaks. This NEW service manager, who started in May, is the best I have ever seen. Knowledgable, honest, friendly, all business, and expects excellence on jobs done. At last, a Dealer from Heaven instead of a Dealer from Hell.