Cam sensors are not that important they are mostly a back-up for the crankshaft sensor since a cam sensor would not be that accurate due to belt or chain slack.
this would throw a code are you getting a check engine light.
this will be the same for the 02 sense would throw a code.
the 02 sensor not sending ground to the ecm would not cause this. the 02 sensor tells the ecm the about the amount of gas in the exhaust. the ecm is constantly fluctuating trying to fine the best air to fuel ratio. that is what the 02 sensor helps with.
these problems would not just happen.
run throw the way you did the work you did. did you remove something that was not put back in the right order.
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Thanks
David