2 error codes popped up today on my OBD reader for my 2015 Diesel Subaru Forester, U0073 and P1468.

I took the car into my local Subaru mechanic and asked for a diagnosis of the error codes. They refused to tell me. They said that they don’t know what the error codes are and that their OBD reader just diagnoses the problem for them.

My question is,

  1. is there an official Subaru OBD code handbook?

  2. What’s the point of having an OBD reader if I can’t locate the codes?

Many thanks in advanced.