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Strange problem with Lambda?

I changed lambda sensor before catalytic converter last night. Since than MIL has come out once and it was that same lambda sensor. We deleted error since it was intermittent. Today all day just fine, but than I plugged obd and the error is present but without MIL. Next strange thing is that car puls better now and there is no obvious change in fuel consumption,but error is still there. My old lambda sensor never had an error, so should I ignore this error and keep driving or should I put the old one back?
Is there anyone here that have or had the same problem?