clearing codes

I had ecu codes designating bad O2 sensors. Replaced both and tried to clear codes. They won't clear. Is this the correct procedure? Am I messing it up somewhere?

"To clear codes:

1) With engine off, stick the blue wires to 1st and 2nd pin in the top row counting from left on the black connector, with notch facing up.
2) Start car. Shut off car. Remove pins.
3) Read codes to make sure they are clear. No codes = steady blinks at 1/4 second intervals. "

Maybe I'll just unhook the battery tonight?

[Beav]

That would be the safer way - remember to write down your radio stations first to make things a bit easier tomorrow morning.

Beav