2007 Ford Focus oxygen sensor

Over the last week I've noticed that my fuel efficiency doesn't seem to be where if probably should be so I decided to run a scan using Torque
I'm just wondering if anyone can help me in seeing it there's a problem with the results please and what might be the cause?

Mode $06 report generated by Torque for Android
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Test report:

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MID:$01 TID:$03
Low sensor Voltage for switch time calculation - O2 Bank 1 Sensor 1
Max: 7.99527V Min: 0V
Test result value: 0.20008V
PASS
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MID:$01 TID:$04
High sensor Voltage for switch time calculation - O2 Bank 1 Sensor 1
Max: 7.99527V Min: 0V
Test result value: 0.62464V
PASS
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MID:$01 TID:$05
Rich to Lean sensor switch time(calculated) - O2 Bank 1 Sensor 1
Max: 470ms Min: 0ms
Test result value: 70ms
PASS
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MID:$01 TID:$06
Lean to Rich sensor switch time(calculated) - O2 Bank 1 Sensor 1
Max: 290ms Min: 0ms
Test result value: 50ms
PASS
----
MID:$01 TID:$90
- O2 Bank 1 Sensor 1
Max: 1.0078Ratio Min: 0Ratio
Test result value: 0.14062Ratio
PASS
----
MID:$02 TID:$90
- O2 Bank 1 Sensor 2
Max: 1.00389Ratio Min: 0Ratio
Test result value: 0Ratio
PASS
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MID:$02 TID:$91
- O2 Bank 1 Sensor 2
Max: 7.99527V Min: 0.0488V
Test result value: 0V
FAIL
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MID:$21 TID:$90
- Catalyst Monitor Bank 1
Max: 0.75582 Min: 0
Test result value: 0.03148
PASS

I had thought it might be a failing oxygen sensor?


Edit: just to add, no fault code showed up nor did any engine light come on.
Cheers