I purchased a Buick Enclave 2010 from you in Dec 2019. Initially when i was looking at the car, I was told the car has some exhaust problems but it would be fixed. Several days later hen i came to drive it off the lot the check engine light came on. You had me wait an hour while you switched a sensor and they were able to turn it off. An hour later the check engine light was back on. After four visits the engine light is still on. I have another appointment tomorrow. I hope it's the last one. I have been very patient. However, I am getting frustrated with this situation.