Aloha,

I have a 2004 Crossfire 6spd Manual and experiencing some issues.

The speedometer does not work
The rear spoiler will not go down even when the car is shut off
The Brake, ESP, BAS, and other lights all on

I get these two codes:
P0410 Secondary Air Injection System Malfunction
P0600 Serial Communication Link Malfunction

I have scanned the forums but I am having difficulty knowing where to start. I was thinking about replacing the speed sensors but there is one in each tire right? Is is possible that all 4 would be bad? I'd rather not spend $200 if its not the problem. I really need some guidance.

Thank you for your help. Please post a link if there is somewhere this has already been addressed.