Do cars with throttle position sensors have oxygen sensors?

Yes, the oxygen sensor is used to check the incomplete combustion of the engine. It is not directly related to the electronic throttle. Besides, your car has an electronic throttle, which is high enough, and the oxygen sensor will definitely match it.

= As far as I know, the oil concentration changes with the opening of the throttle position sensor =

Wrong, if the electronic throttle is open, the air intake will be large. If an electrical signal is sent to the computer, the computer will increase the fuel injection quantity according to the opening, not the concentration, which is only available after mixing with air.

At present, it is not allowed to produce cars without throttle position sensors because the emissions are not up to standard. If there is no throttle, there will be no oxygen sensor.