Engine light code: P0422; Catalytic Efficency Below Threshold. Hmm... Anyone familiar with this and what it means? Should I be concerned? Thanks.

 

Mine just had the same code. I took it to a volvo shop and they turned of the light. They said he would have to be hooked up to Vida software to tell for sure what the cause is. The good news is that the light never came back on. From what I have learned it could be anything from bad gas (cheap) to injector problems and more.