ECU question.

[och]

Can someone confirm whether it's normal or not for the ECU not to throw a CEL right after the primary O2 sensors are disconnected? My ECU throws the CEL about half hour after the O2s are disconnected.

The car is a 1994 LS400, first gen, OBDI

 

[Lextreme II]

Normal... also make sure your cat is good too. Cat can also create CEL too.

 

[och]

No, its just that when I was replacing my O2 sensors, about a year ago, I had the old sensors removed and drove like that for about 30 minutes until the CEL was triggered. I thought it was suposed to be triggered right away if O2 sensors aren't connected.