I am finishing up tuning on a 2009 Cobalt LNF Turbo with full exhaust and aftermarket front mount. Otherwise a factory setup. I recently replaced the upstream wideband O2 and it temporarily fixed the "CL - Fault" obswerved in hptuners.

Now it is back to being stuck in Fault mode while in CL, which appears that when that happens, it runs the commanded equivalence ratio from power enrichment. Any ideas? Thanks in advance