1999 Volvo S80 Questions

Unanswered 1999 Volvo S80 Questions

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If I start my car to warm it up, it smells really strong around my car of gas fumes and inside the car a little as well?
what does that mean ? is there a problem with transmission?
No messages, no light on on dashboard. It happened a day after when mechanic guy changed O2 sensors and erased the triangle light on dashboard.The only thing that I've done was driving from the service shop to my home...
how to add transmission fluid to my volvo