last night: took rx8 to 1/4 mile and beat a turbo mini cooper, made me really happy.
as i was pulling into parking spot at home the car died, no idea why....started right back up. maybe related to below?? no idea, took it around the block a few times checked all power levels everything sounded good, nothing looked wrong under the hood granted id prolly have no idea.

morning: its raining decently hard, i get in my car, start her up and bam check engine light.

i check the codes with my ap, U0073 and some p0410(not right number?). the U0073 i can't find online and the AP didnt recognize it, the p0410 was incorrect air flow, i figure that my AEM CAI water shield is wet and blocking some airflow so hopefully im OK. i reset the codes and started driving with radio off listening, no odd sounds, still sounds the same at high rpm....so maybe the U0073 was related to the incorrect airflow.

any ideas?

 

I think that the ODBII U0073 is a communication error