I know the P0410 code problem has had considerable discussion here but I need to bring it up again to see what members suggest for my issue.
History: Check engine light comes on -- check it with code reader and P0410 shows. Read the threads here on crossfireforum and 1: changed the RCM relay - cleared code and all good for a month or two and then code reappears 2: checked the check valve which is working cleaned the check valve - cleared code an all good for a couple of weeks then code reappears. 3: had a local garage pull the codes and their opinion was the secondary air pump is the culprit - purchase a new secondary air pump - install pump -- clear code and all good for a couple of days and the once again the check engine light comes on!

I would add that after I changed out the relay and the check engine light came on I found that after a couple of days the check engine light would go off and then reappear again in a few days. Not sure if this is significant or not.

Any insight from any members much appreciated.