My check engine light came on so I took it to a VW dealer. They told me that I need to pay $900 + to have a whole carbon cleanout done. Is there a cheaper fix to this problem? So far I have only run one can of Seafoam and one bottle of Lucas DPF cleaner in my tank to help. The light is still on. Should I try a few cans of Seafoam before I remove the EGR valve to clean myself?