New O2 Sensors - Do they require Breaking in?

[luggie]

I have put new O2 sensors into my Gen 3 Prelude in the last six months or so. I found that they actually increased my fuel consumption in the first few tanks then after a long drive and a few more tanks the fuel consumption began to improve. Im wondering if O2 sensors need to be broken in to function optimally or the cars computer takes a while to get used to the new signals that the refreshed sensors would generate. My understanding is the car has a a short term and long term memory for achiving the best air fuel ratio based on sensor output..

Any more scentific explainations???

[dsp26]

nah they don't need breaking in.

changing from a rooted sensor to a new one is like getting a new exhaust system. the ecu sorta has to re-learn only coz it got used to the shitty signals it got from the dud.

a new one will provide A/F signals out of the "learned" range of the dud

[iamhappy46]

Did you reset the ECU after fitting the O2 sensors? There is plenty of info on the forum on why it needs to be done after such a big change

[ECU-MAN]

O2 sensors dont need to be run in.

as mentioned above, its best to reset the ECU.

[luggie]

yep ECU was reset.... car definatly did not respond to the change in positive way, running rich etc. has slowly improved. I think after about 5 tanks of fuel Im starting to see improvement and economy coming back