Mk2 Aygo engine sensors where?

[Cal5028]

Hello

I posted recently about my 2015 Aygo running pretty well but not quite 100%. I've found that doing some good hard pulls in it does make it better, but for that reason, I do believe the engine is caked in from the previous owner doing many thousand miles of city driving. Recap: 2015 Aygo, around 26.000 miles of mostly city driving, runs PERFECT at >3000 rpm and stutters a bit below.

I've had enough and I just want to change any potential sensors that could be caked with soot and carbon. I imagine it has an oxygen sensor (does it have two? one before and one after the catalytic converter?). Are these the only two sensors that could be caked with soot?

If anyone else have any good ideas on things to replace / do to make it run nicer, please do chime in. Thanks!