After replacing the ECT sensor for my 1994 Honda Accord EX, check engine light is on and marks code 6?

After I fixed the issue with the sensor my check engine light is on and indicates code 6 which is that of the ECT sensor but it's working fine so why is it marking that code? Second ever since replacing that sensor my car won't Start as easy in the morning as it used to. Sometimes after running
It for a while and I turn it off, I get this smell of it not using the gas correct because it's smells fresh.

Put the old sensor back in and leave your car alone.