207 Antipollution Fault

Hello, I took my car to my master last week because it had a 207 1.4 gasoline antipollution fault and the fault light was on. The oxygen sensor turned out to be defective, we replaced it with a Bosch brand, I deleted the fault code and used it for a few days without any trouble, but today it gave the same error, and turned on the fault lamp. I was driving on gasoline at low speed and under a quarter tank. My vehicle has Catalyst canceled. Is there a definitive solution to this problem? What do we need to do?

I have that trouble in me, as a solution, when I use the vehicle in gasoline, the warning is gone, if there is a warning. But that warning has many variables, I hope you can solve it ...

There is no Lpg in my vehicle. We solved the problem by changing the coil today

Best wishes ;)