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Q: Is my transmission going bad on 2007 Suzuki Reno

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
car is sluggish in power and drifts back in drive on hills , check engine light go off and on, has been diagnosed to need a oxygen sensor, but that does not explain the lack of power
did change the oil gasket, and spark plugs that seem to have help for a while but now its sluggish again, but not as much as before eventually it picks up speed
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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It sounds like you suspect the transmission but all you've told me about the car is about the engine. If the engine runs well and the transmission is slipping and not driving the car positively, then you have a transmission problem. I recommend you find a transmission shop or a Suzuki specialist to diagnose it.
Do it soon, the less damage you do the less you have to fix if you end up rebuilding it.
If you want to find a specialist, here's a directory link for you:
Find Out Why Your Check Engine Light Is On
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