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Hello, I am Jose Sebastian. Your automotive expert, It's a pleasure to me to attend your question. Thank you very much for trust in just answer.
Dear customer, the dark smoke or with black coloration usually tends to be excess fuel, therefore due to the symptoms that you present and due to this smoke,it is likely that you have a problem at the injection system level, perhaps one of the injectors is sending fuel direct that is not correctly burned that is why the smoke comes out of the exhaust and also a good revolution is not raised.
The oxygen sensor can be detected through the Diagnostic tool. It is better to perform a diagnosis and verify the error codes to see if they are pointing out the sensor.
Dear customer, any mechanical garage can make that diagnosis that I recommend.
Dear customer, in that case, replace the sensor if you want and then to reset the code you are only going to disconnect the battery from the negative terminal with the positive connector connected for 30 seconds. It is not ideal but at least you could rule out the sensor that is cheaper than having to do maintenance on the injection system.