O2 sensor & throttle body

[Vauxmad11]

Soooo my vectra 1.9 cdti was jumping from 800rpm to 1000rpm every so often so changed the O2 sensor and cleaned throttle body and it seems to be running alot better, but kicking out abit of smoke 🤔 would this be the engine getting used to the new O2 sensor and throttle body ? Any advice would be much appreciated 👍

[Dog_Book]

To find out and learn about this engine my advice would be to look in the engine troubleshooting section as you will find answers there fast. If you take the time to look of course.