My son bought a 2010 Gt two years ago sweet ride but we've been having O2 sensor issues lately. Here's the spec.
4.6 V8 with Borla catless exhaust Ford after market injectors and K&N air filter. Back in August the right upper bank O2 Sensor has failed three times. We've check the wiring harness, plug connecter and there are no leaks in the exhaust. Since the issue we have installed a BAMA tuner, Cold air intake (installed last month) and Bosch Irridium plugs (plugs just replaced this week)...

2010 Gt O2 Sensors keep failing