I need some help!

I used to get CEL and code 1 on my winterbeater, a 1990, 1.6 Civic when the engine got up to working temperature, so I replaced the O2-sensor with a brand new one.

Now I dont get a code, but the CEL still goes on when the engine gets up to normal working temperature. Car works fine though, no limp home mode or anything like that. maybe a little rough idle, but what can you ask from a car with ~140.000+ miles...

Whats wrong? Any ideas?

/Tom

 

maybe a bad O2 again or something fouling out O2 or even a bad ecu maybe

 

The O2-sensor is brand new, so it should be ok, and like I said, no code is being throwed by the ECU.

I dont think it's a bad ECU either since the light only comes on when the engine is up to normal working temperature. If I then turn the engine off and restart it, it takes like a minute before it lights up again.

Any other ideas?

/Tom