95 GT HEGO (again??)

After changing my HEGO sensors I got more HEGO codes after my check engine light comes on again. (Actron code tester - audible beeps)
First time around I got the following codes :
111 111 1 181 189 181 189
I changed the HEGO sensors and my pre-ignition went away, car ran great. 20 miles or so later the light comes on again. Now I get these codes:
111 111 1 172 176 172 176
Any ideas?
 
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