we have carbon build up on the heads in our van. They want to pull the heads on 2003 Volkswagen EuroVan

They want to pull the heads and clean it. This process is very expensive. We only have 50,000 miles and have taken very good care of this van. What would you recommend we do?
Thank you for any help you can provide. We have spend over $2,000 so far with our mechanic trying to fix this problem The engine light came on and that is who we were aware of this problem.

Asked by for the 2003 Volkswagen EuroVan
Hi, I have the same problem with my 99 Eurovan. What did you do to resolve? My van has 200,000 miles on it tho. I had just spent 3k on repairs when they found this problem and yes, they said we needed to pull the heads and clean. YIKES!!