Hope for some quick help, I’ve been using a Spartan 2 on an older car for a few years - just replaced the engine and I had some issues breaking it in with a bad manifold leak. At some point I lost AFR reading and I’ve tracked it at this point to a blown 5 amp fuse. Replacing fuse immediately blows the new one.
Question is: Is this a sign of a bad controller or wiring (neither were moved during the engine work), or could this be a bad wideband sensor?