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Do error codes self cancel? 200 1992

posted by  Grey245 on  Mon Jan 18 09:23 CST 2021
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The codes I tried to erase with the reset procedure returned within about 30 seconds. The hard reset I did next erased them permanently, and for now that was all that was needed.

My hypothesis is that the long term fuel trim went outside the permissible window, and clearing the DTCs did not change those trim values, so they returned quickly.
The hard reset cleared everything and with the cause being absent (for now) no CEL or DTCs have returned.





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