So I bought a 2005 Volvo s40. On the way home the other night I got a " Service power system urgent " in bright red letters. I had the Battery and alternator checked at a autozone and they said they were fine. Ant thoughts?

I also have a check engine light for two codes. 2187 and 2407

I bought a MAF sensor, Timing belt serpentine belt evap canister and purge valve. I have not put any of these on yet.

I have already installed front control arms, sway bar links, gas cap, and struts.

I really like the little guy but I have to wonder when I should cut my losses.

Thank you in advance