One problem related to emission control has been reported for the 1999 Plymouth Grand Voyager. The most recently reported issues are listed below.
Egr system failure (failing airbags, horn, and cruise control system)-as per an article in todays atlanta journal-constitution, you are currently probing Plymouth Grand Voyagers from model years 1998 & 1999 due to 109 complaints regarding failing airbags, horns, and cruise control systems. Therefore, since my van had the same problem, I want to be added to your list.