most likely not an O2 sensor issue, but a vacuum leak. Check all the hoses and connections (odds are you'll find a couple that have cracked/weathered..

Here's some info on your code...

Diagnostic trouble code (DTC) information

Condition

The control module receives information from the heated oxygen sensor (HO2S) about the fuel / air mixture when idling at both the lower and upper part-load range. If the fuel / air mixture deviates from λ=1, the short-term fuel trim will compensate for this by adjusting the injection time so that λ=1 is achieved. When the short-term fuel trim makes an adjustment, the integrator median must be adjusted by the long-term trim. Diagnostic trouble code (DTC) ECM-262A will be stored when the long-term trim must be adjusted almost to maximum in the idle range.


Substitute value
none


Possible source

Upper limit:
-intake air leakage
-exhaust system air leakage
-defective heated oxygen sensor (HO2S)
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If you're not driving it "like its stolen," are you really driving?