Mufflers repair service near Vernon Hills, IL

Rating on Carx, Schaumburg, IL: Poor Diagnosis, Manager is very rude and no guarantee to the parts and labor even if the same problem occurs in next two days. Please don't go to this shop, If you get check engine signal. actually I could rate this shop zero star. Now a days These CARX guys are cheating customers. The manager Bill always gives high bill. Don't believe their free diagnosis test. They don't find real problem, rather they fix some thing and if the problem comes back again even in next couple of days, they don't help on that. Here is my story. I have been going through this CARX shop for since last 4 years. In the year 2008 and 2009 this CARX mufflers were really good. They always help to customers to fix the car problems with less price and with 99% guarantee on the work they did. After this new manager name Bill came into Schaumburg, CARX, this shop became like cheaters shop. Recently I took my Toyota corolla car to fix check engine signal. they did diagnosis and said code P0171, that means exhaust or lean engine problem..blah..blah. Then I told them, I will come back in 2 days and I did same. I dropped my car to fix check engine signal, This time different mechanic in same CARX and he said he saw different code with computer and replaces throttle sensor and other...and they gave me bill $588 for check signal ($330) and AC recharge. ($158). After I drove 50 miles, check engine light came back. I took car to CARX again. now this same mechanic who repaired it said that he is saying code PO171 that is the same one their other mechanic told very first time. This guy did something again and said fixed. After I drove 25 miles, check engine signal came back. I called manager Bill for same. He told that his mechanic is out of town and he asked me to comeback after 2 weeks. Then I took my car to carx on 08/12/11 friday, This time mechanic is there. Now the drama started. They simply said that, they can't determine which is causing PO1

Awful place. I brought my car there because the front driver's side wheel was making a scraping sound. The owner Bill went on a ride with me so he could hear the sound, which he did and had an idea of what it could be. I brought the car back during my scheduled time, which after waiting for about 4 hours after I dropped it off that they can't figure out what is wrong with it, saying there seems to be nothing wrong with the "rear: tires. They spent 4 hours looking at the wrong end of the car. I told them and the owner knew that it was the front driver side. After 3 more hours after the phone call I go there to see what is going on to find my car outside, not even being looked at. And no phone call giving me any more information on it. The girl at the front desk said it "must be my brakes" and I should get a certain kind to fix the issues. The brakes are BRAND NEW CERAMIC BRAKES, not cheap metallic ones. It's not the brakes. Then she said it must be the rotors because they had some wear on them. Please you have no idea what it is and the owner decided to go home a few hours after they opened. Poor Communication. Lastly, I took my car home to find grease all over the driver side interior door and a large scratch right in the doorway (freshly scratched). The grease has been a pain to get off and the scratch is down to the metal. I have photos to post as well. POOR SERVICE.