I've been using you guys for years. I know you guys do good work. This time I felt like maybe I could have done without the recommended service, considering all the failed part was, was a sensor, that doesn't affect mpg or driveability or anything, just triggered a Check Engine light. It was more than I wanted to spend for no real improvement to my vehicle. Also, the coupons I get in the emails, expired like the week before the service. That was annoying. Try lengthening the expiration.