Emission problem C4 1.6 VTi

[Romplaaja]

My C4 1.6 VTi 2011 fails the emission test.
CO% is 0,55 (should be under 0,2 to go through)
HC PPM 9
CO2 14,8
O2 0,34
Lambda 0,999

I recorded o2 sensor readings

Could it be faulty o2 sensor?

[notnacakul]

Hello, did you find a solution? Thank you.