2008 Mercedes GL450 Check Engine Light On: P0060, P0054, and P0420 Fault Codes Explained

Model: Mercedes Fault Code: P0054 Posted: 2020-03-08 13:40

Hello! I'm new to this forum and would really appreciate some help with the check engine light on my 2008 Mercedes GL45-0. The vehicle has 159,000 miles and recently came back up with fault codes P0060, P0054, and P0420 after I replaced both upper oxygen sensors about two months ago. Since then, the check engine light has reactivated. As a budget-conscious owner, I'm trying to fix this myself without spending much on repairs. Can anyone explain what these codes mean and suggest possible fixes? Thank you in advance for your guidance.