We buy cars selling faulty/broken vehicles to the public

Purchased a vehicle in Feb 2023 first week engine light came on was sent to AE auto they defatted the vehicle and now a few months down the line engine light still an issue sitting here at are auto today typing this review. I personally think that we buy cars are selling faulty vehicles this is sad because we invest our hard earned money into buying their s****s. I will be taking this matter further and will be bringing out names and emails of everyone involved.