thats what happens mate. that happened to mine. will come back on in about 2 weeks or so. whats happening is the O2 sensor is working, but at some point it will mess up and the ecu will automatically revert back to it original pre-installed fuelling and will not used closed loop so willl throw the fault up that the lambda (O2) sensor has a low voltage/ unresponsive/slow output or something along those lines.
no biggie at all mate.