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Lambda overlay vs wideband

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I was wondering which is usually more accurate lambda overlay or wideband. Current afr on aem wideband is 12s afr DD on lambda it is 14s.

I think wideband is a bit off. When i full throttle it jumps 11 then 13 and back and forth. Its not consistence so im wondering if lambda overlay is usually accurate if it is, imma look throught it while my 02 sensor for wideband comes in

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