2013~2016 Location of the CX-5 upstream 02 sensor?

[razzer1]

Hi everyone, I have a 2014 CX-5 2.2D Skyactiv that's just had an head gasket rebuild at 131,000 miles. The eml has come on and diagnosed with code p0133 for 02 sensor 1 bank 1, which I believe is the upstream 02 sensor.

Does anyone know the location of the upstream 02 sensor?

Any help is much appreciated!