Hey guys new to this forum, i decided to join because my gf just got a 1997 audi a4 12v with tons of issues.

Few check engine codes are :

P1409

P1408 coolant signal too high i believe it said.

all the codes for the 02 sensors but all of them were replaced but the codes resurfaced.

I appologize for the mess of a post i made. Another problem i have is the cars outside temp sensor is always innacurate im not sure if thats a symptom of the code P1408.