Original issue occured when my wideband fuse blew, no rhyme or reason. Once the fuse was replaced, the guage would read only "rc" at startup then go black. I've run every test listed and directed by a PLX technician. I have checked all connections 20+ times and even changed the power plug. O2 seems funcioning, giving the proper readouts. O2 wires under car were also checked and found to be secure.
I have spoken to a technician regarding this issue. I returned the SM AFR for repair: RMA040807. The return sheet indicated the unit was replaced. Of confusion though is that there is indication that my old unit was tested and passed all checks (or is the test results verifying the new unit passes all tests)? Either way, I have been unsuccessful in getting through by email or phone. The new unit is functioning EXACTLY the same as my old one. At start up, guage reads "rc" for several seconds then goes black. Is there any means to check the guage itself, ohms, etc? I suppose I should have sent the guage back too for inspection/servicing. What do I need to do to check the guage or get it replaced? I was told not to drive my car with the wideband not functioning, it's been more than a month now given shipping and turn around time frames. Please help! As always, much appreciation!