2006 MPS3 front O2 sensor - which connector?

Hi,

I'm experiencing some reduced fuel consumption and an increase in black smoke under acceleration, I'm planning on replacing the front O2 sensor and MAF - the mechanic can't fault the engine itself and suggested replacing these.

Is it the two plug or one plug connector in a late 2006 MPS3 ... which one?

O2 Sensor Mazda 3 MPS L3 2 3L Turbo Front Oxygen Sensor 02 06 09 2 Plug | eBay

Mazda 3 MPS Oxygen O2 Sensor BK L3 LF 06 08 Front | eBay

Thanks

JB