I own a 2005 Mazda 3 (SP 2.3 Manual) and I took the car to get the annual emissions test. During the OBD part of the test, my CEL came on, and the test listed a code of U0121.
As far as I can tell from my searching the internet, all the code means is that the test itself can't communicate with the ABS system.
A couple days after the test, the CEL dismissed itself, with no action on my part.
- Am I correct in thinking that replacing a fuse would fix the U0121 code? If not, what is the right solution for that code?
- Given that the CEL has dismissed itself, if I were to go back to get another emissions test, would it pass without any further action on my part?