Welcome! What's going on with your car? Hi...

Welcome! What's going on with your car? Hi recently I replaced ignition plugs and air filter for my Chevrolet trailblazer then after a week it started showing engine light when check it's showing P0411, P1174,P013B please guide me the possible cause for inspection What is the model/year of your car? Chevrolet trailblazer 2008 Are you fixing your vehicle yourself? What have you tried so far? No through the workshop Anything else you want the mechanic to know before I connect you? He is saying it's normal nothing problem