[QUOTE]Originally posted by Arthur Dalton
[B]If the ECU is reaching its limit stops, then that indicates that
the sensors involved in lean/rich mix are sending signals , but the mix is so far off that the mapping can't compensate.... so I doubt
an 02 sensor prob...
And if your O2 signal is getting weak, and the cross-counts drop, you will also likely reach your adaption limits.
I am not trying to sell you an O2 sensor but, keep in mind, they are considered a part of a major tune-up.
Keep us informed what you find.