How can I resolve these car issues?

Subject: How can I resolve these car issues? 17/4/2010, 2:39 am

a. I had the oxygen sensor replaced a few months ago and now the light is on again and it's not working.
b. I had my transmission fluid replaced last week but now my car shakes badly when I start it, when I drive slow and when I stop. What could cause that? It's a 99 Touota 4-runner.

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